Home / 129,309.12-178,432.08-72,719.28

Finding the Fourth Proportional to 129,309.12, 178,432.08 and 72,719.28

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Solution

The fourth proportional to 129,309.12, 178,432.08 and 72,719.28 is: 100,344.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,309.12 : 178,432.08 = 72,719.28 : x
  2. Step 2: Convert to fraction form
    129,309.12/178,432.08 = 72,719.28/x
  3. Step 3: Cross multiply
    129,309.12x = 178,432.08 × 72,719.28
  4. Step 4: Simplify right side
    129,309.12x = 12,975,452,386.50
  5. Step 5: Solve for x
    x = 12,975,452,386.50/129,309.12
  6. Step 6: Final answer
    x = 100,344.45

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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.