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Finding the Fourth Proportional to 125,920.40, 188,811.48 and 86,487.44

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Solution

The fourth proportional to 125,920.40, 188,811.48 and 86,487.44 is: 129,683.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,920.40 : 188,811.48 = 86,487.44 : x
  2. Step 2: Convert to fraction form
    125,920.40/188,811.48 = 86,487.44/x
  3. Step 3: Cross multiply
    125,920.40x = 188,811.48 × 86,487.44
  4. Step 4: Simplify right side
    125,920.40x = 16,329,821,547.81
  5. Step 5: Solve for x
    x = 16,329,821,547.81/125,920.40
  6. Step 6: Final answer
    x = 129,683.69

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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.