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Finding the Fourth Proportional to 125,931.30, 188,459.55 and 86,565.30

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Solution

The fourth proportional to 125,931.30, 188,459.55 and 86,565.30 is: 129,547.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,931.30 : 188,459.55 = 86,565.30 : x
  2. Step 2: Convert to fraction form
    125,931.30/188,459.55 = 86,565.30/x
  3. Step 3: Cross multiply
    125,931.30x = 188,459.55 × 86,565.30
  4. Step 4: Simplify right side
    125,931.30x = 16,314,057,483.62
  5. Step 5: Solve for x
    x = 16,314,057,483.62/125,931.30
  6. Step 6: Final answer
    x = 129,547.28

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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.