Home / 1,387,000.10-2,080,500.15-389,728.10

Finding the Fourth Proportional to 1,387,000.10, 2,080,500.15 and 389,728.10

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Solution

The fourth proportional to 1,387,000.10, 2,080,500.15 and 389,728.10 is: 584,592.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387,000.10 : 2,080,500.15 = 389,728.10 : x
  2. Step 2: Convert to fraction form
    1,387,000.10/2,080,500.15 = 389,728.10/x
  3. Step 3: Cross multiply
    1,387,000.10x = 2,080,500.15 × 389,728.10
  4. Step 4: Simplify right side
    1,387,000.10x = 810,829,370,509.22
  5. Step 5: Solve for x
    x = 810,829,370,509.22/1,387,000.10
  6. Step 6: Final answer
    x = 584,592.15

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.