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Finding the Fourth Proportional to 931.73, 1,285.67 and 558.66

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Solution

The fourth proportional to 931.73, 1,285.67 and 558.66 is: 770.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.73 : 1,285.67 = 558.66 : x
  2. Step 2: Convert to fraction form
    931.73/1,285.67 = 558.66/x
  3. Step 3: Cross multiply
    931.73x = 1,285.67 × 558.66
  4. Step 4: Simplify right side
    931.73x = 718,249.61
  5. Step 5: Solve for x
    x = 718,249.61/931.73
  6. Step 6: Final answer
    x = 770.88

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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.