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Finding the Fourth Proportional to 640.16, 958.60 and 557.52

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Solution

The fourth proportional to 640.16, 958.60 and 557.52 is: 834.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.16 : 958.60 = 557.52 : x
  2. Step 2: Convert to fraction form
    640.16/958.60 = 557.52/x
  3. Step 3: Cross multiply
    640.16x = 958.60 × 557.52
  4. Step 4: Simplify right side
    640.16x = 534,438.67
  5. Step 5: Solve for x
    x = 534,438.67/640.16
  6. Step 6: Final answer
    x = 834.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.