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Finding the Fourth Proportional to 339,179.40, 508,769.10 and 86,459.40

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Solution

The fourth proportional to 339,179.40, 508,769.10 and 86,459.40 is: 129,689.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,179.40 : 508,769.10 = 86,459.40 : x
  2. Step 2: Convert to fraction form
    339,179.40/508,769.10 = 86,459.40/x
  3. Step 3: Cross multiply
    339,179.40x = 508,769.10 × 86,459.40
  4. Step 4: Simplify right side
    339,179.40x = 43,987,871,124.54
  5. Step 5: Solve for x
    x = 43,987,871,124.54/339,179.40
  6. Step 6: Final answer
    x = 129,689.10

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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.