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Finding the Fourth Proportional to 714,747.12, 986,362.56 and 392,487

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Solution

The fourth proportional to 714,747.12, 986,362.56 and 392,487 is: 541,638.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,747.12 : 986,362.56 = 392,487 : x
  2. Step 2: Convert to fraction form
    714,747.12/986,362.56 = 392,487/x
  3. Step 3: Cross multiply
    714,747.12x = 986,362.56 × 392,487
  4. Step 4: Simplify right side
    714,747.12x = 387,134,482,086.72
  5. Step 5: Solve for x
    x = 387,134,482,086.72/714,747.12
  6. Step 6: Final answer
    x = 541,638.39

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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.