Home / 918,000.20-1,377,000.30-287,107.40

Finding the Fourth Proportional to 918,000.20, 1,377,000.30 and 287,107.40

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Solution

The fourth proportional to 918,000.20, 1,377,000.30 and 287,107.40 is: 430,661.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,000.20 : 1,377,000.30 = 287,107.40 : x
  2. Step 2: Convert to fraction form
    918,000.20/1,377,000.30 = 287,107.40/x
  3. Step 3: Cross multiply
    918,000.20x = 1,377,000.30 × 287,107.40
  4. Step 4: Simplify right side
    918,000.20x = 395,346,975,932.22
  5. Step 5: Solve for x
    x = 395,346,975,932.22/918,000.20
  6. Step 6: Final answer
    x = 430,661.10

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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.