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Finding the Fourth Proportional to 129,238.94, 178,348.74 and 71,878.76

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Solution

The fourth proportional to 129,238.94, 178,348.74 and 71,878.76 is: 99,192.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,238.94 : 178,348.74 = 71,878.76 : x
  2. Step 2: Convert to fraction form
    129,238.94/178,348.74 = 71,878.76/x
  3. Step 3: Cross multiply
    129,238.94x = 178,348.74 × 71,878.76
  4. Step 4: Simplify right side
    129,238.94x = 12,819,486,278.76
  5. Step 5: Solve for x
    x = 12,819,486,278.76/129,238.94
  6. Step 6: Final answer
    x = 99,192.13

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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.