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Finding the Fourth Proportional to 640.55, 884.40 and 472.53

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Solution

The fourth proportional to 640.55, 884.40 and 472.53 is: 652.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.55 : 884.40 = 472.53 : x
  2. Step 2: Convert to fraction form
    640.55/884.40 = 472.53/x
  3. Step 3: Cross multiply
    640.55x = 884.40 × 472.53
  4. Step 4: Simplify right side
    640.55x = 417,905.53
  5. Step 5: Solve for x
    x = 417,905.53/640.55
  6. Step 6: Final answer
    x = 652.42

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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.