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Finding the Fourth Proportional to 129,300.40, 178,432.40 and 71,939.12

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Solution

The fourth proportional to 129,300.40, 178,432.40 and 71,939.12 is: 99,274.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,300.40 : 178,432.40 = 71,939.12 : x
  2. Step 2: Convert to fraction form
    129,300.40/178,432.40 = 71,939.12/x
  3. Step 3: Cross multiply
    129,300.40x = 178,432.40 × 71,939.12
  4. Step 4: Simplify right side
    129,300.40x = 12,836,269,835.49
  5. Step 5: Solve for x
    x = 12,836,269,835.49/129,300.40
  6. Step 6: Final answer
    x = 99,274.79

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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.