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Finding the Fourth Proportional to 129,487.80, 193,842.90 and 76,870.20

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Solution

The fourth proportional to 129,487.80, 193,842.90 and 76,870.20 is: 115,074.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,487.80 : 193,842.90 = 76,870.20 : x
  2. Step 2: Convert to fraction form
    129,487.80/193,842.90 = 76,870.20/x
  3. Step 3: Cross multiply
    129,487.80x = 193,842.90 × 76,870.20
  4. Step 4: Simplify right side
    129,487.80x = 14,900,742,491.58
  5. Step 5: Solve for x
    x = 14,900,742,491.58/129,487.80
  6. Step 6: Final answer
    x = 115,074.49

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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.