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Finding the Fourth Proportional to 129,688.40, 194,225.40 and 87,909.20

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Solution

The fourth proportional to 129,688.40, 194,225.40 and 87,909.20 is: 131,655.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,688.40 : 194,225.40 = 87,909.20 : x
  2. Step 2: Convert to fraction form
    129,688.40/194,225.40 = 87,909.20/x
  3. Step 3: Cross multiply
    129,688.40x = 194,225.40 × 87,909.20
  4. Step 4: Simplify right side
    129,688.40x = 17,074,199,533.68
  5. Step 5: Solve for x
    x = 17,074,199,533.68/129,688.40
  6. Step 6: Final answer
    x = 131,655.56

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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.