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Finding the Fourth Proportional to 640.66, 956.36 and 558.63

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Solution

The fourth proportional to 640.66, 956.36 and 558.63 is: 833.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.66 : 956.36 = 558.63 : x
  2. Step 2: Convert to fraction form
    640.66/956.36 = 558.63/x
  3. Step 3: Cross multiply
    640.66x = 956.36 × 558.63
  4. Step 4: Simplify right side
    640.66x = 534,251.39
  5. Step 5: Solve for x
    x = 534,251.39/640.66
  6. Step 6: Final answer
    x = 833.91

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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.