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Finding the Fourth Proportional to 557.60, 767.21 and 445.61

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Solution

The fourth proportional to 557.60, 767.21 and 445.61 is: 613.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.60 : 767.21 = 445.61 : x
  2. Step 2: Convert to fraction form
    557.60/767.21 = 445.61/x
  3. Step 3: Cross multiply
    557.60x = 767.21 × 445.61
  4. Step 4: Simplify right side
    557.60x = 341,876.14
  5. Step 5: Solve for x
    x = 341,876.14/557.60
  6. Step 6: Final answer
    x = 613.13

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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.