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Finding the Fourth Proportional to 699.71, 964.85 and 478.31

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Solution

The fourth proportional to 699.71, 964.85 and 478.31 is: 659.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.71 : 964.85 = 478.31 : x
  2. Step 2: Convert to fraction form
    699.71/964.85 = 478.31/x
  3. Step 3: Cross multiply
    699.71x = 964.85 × 478.31
  4. Step 4: Simplify right side
    699.71x = 461,490.19
  5. Step 5: Solve for x
    x = 461,490.19/699.71
  6. Step 6: Final answer
    x = 659.55

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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.