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Finding the Fourth Proportional to 318,138.46, 438,884.78 and 281,876.63

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Solution

The fourth proportional to 318,138.46, 438,884.78 and 281,876.63 is: 388,860.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,138.46 : 438,884.78 = 281,876.63 : x
  2. Step 2: Convert to fraction form
    318,138.46/438,884.78 = 281,876.63/x
  3. Step 3: Cross multiply
    318,138.46x = 438,884.78 × 281,876.63
  4. Step 4: Simplify right side
    318,138.46x = 123,711,363,841.90
  5. Step 5: Solve for x
    x = 123,711,363,841.90/318,138.46
  6. Step 6: Final answer
    x = 388,860.13

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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.