Home / 129,478.18-178,680.18-72,117.04

Finding the Fourth Proportional to 129,478.18, 178,680.18 and 72,117.04

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Solution

The fourth proportional to 129,478.18, 178,680.18 and 72,117.04 is: 99,521.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,478.18 : 178,680.18 = 72,117.04 : x
  2. Step 2: Convert to fraction form
    129,478.18/178,680.18 = 72,117.04/x
  3. Step 3: Cross multiply
    129,478.18x = 178,680.18 × 72,117.04
  4. Step 4: Simplify right side
    129,478.18x = 12,885,885,688.27
  5. Step 5: Solve for x
    x = 12,885,885,688.27/129,478.18
  6. Step 6: Final answer
    x = 99,521.68

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1.5x scale

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.