Home / 129,509.28-178,720.08-72,148.52

Finding the Fourth Proportional to 129,509.28, 178,720.08 and 72,148.52

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Solution

The fourth proportional to 129,509.28, 178,720.08 and 72,148.52 is: 99,563.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,509.28 : 178,720.08 = 72,148.52 : x
  2. Step 2: Convert to fraction form
    129,509.28/178,720.08 = 72,148.52/x
  3. Step 3: Cross multiply
    129,509.28x = 178,720.08 × 72,148.52
  4. Step 4: Simplify right side
    129,509.28x = 12,894,388,372.68
  5. Step 5: Solve for x
    x = 12,894,388,372.68/129,509.28
  6. Step 6: Final answer
    x = 99,563.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.