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Finding the Fourth Proportional to 640.56, 953.28 and 617.52

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Solution

The fourth proportional to 640.56, 953.28 and 617.52 is: 918.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.56 : 953.28 = 617.52 : x
  2. Step 2: Convert to fraction form
    640.56/953.28 = 617.52/x
  3. Step 3: Cross multiply
    640.56x = 953.28 × 617.52
  4. Step 4: Simplify right side
    640.56x = 588,669.47
  5. Step 5: Solve for x
    x = 588,669.47/640.56
  6. Step 6: Final answer
    x = 918.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.