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Finding the Fourth Proportional to 520,087.10, 780,130.65 and 165,128.90

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Solution

The fourth proportional to 520,087.10, 780,130.65 and 165,128.90 is: 247,693.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,087.10 : 780,130.65 = 165,128.90 : x
  2. Step 2: Convert to fraction form
    520,087.10/780,130.65 = 165,128.90/x
  3. Step 3: Cross multiply
    520,087.10x = 780,130.65 × 165,128.90
  4. Step 4: Simplify right side
    520,087.10x = 128,822,116,090.79
  5. Step 5: Solve for x
    x = 128,822,116,090.79/520,087.10
  6. Step 6: Final answer
    x = 247,693.35

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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.