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Finding the Fourth Proportional to 129,300.59, 178,433.65 and 72,710.75

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Solution

The fourth proportional to 129,300.59, 178,433.65 and 72,710.75 is: 100,340.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,300.59 : 178,433.65 = 72,710.75 : x
  2. Step 2: Convert to fraction form
    129,300.59/178,433.65 = 72,710.75/x
  3. Step 3: Cross multiply
    129,300.59x = 178,433.65 × 72,710.75
  4. Step 4: Simplify right side
    129,300.59x = 12,974,045,053.71
  5. Step 5: Solve for x
    x = 12,974,045,053.71/129,300.59
  6. Step 6: Final answer
    x = 100,340.18

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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.