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Finding the Fourth Proportional to 625.84, 864.40 and 478.40

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Solution

The fourth proportional to 625.84, 864.40 and 478.40 is: 660.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.84 : 864.40 = 478.40 : x
  2. Step 2: Convert to fraction form
    625.84/864.40 = 478.40/x
  3. Step 3: Cross multiply
    625.84x = 864.40 × 478.40
  4. Step 4: Simplify right side
    625.84x = 413,528.96
  5. Step 5: Solve for x
    x = 413,528.96/625.84
  6. Step 6: Final answer
    x = 660.76

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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.