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Finding the Fourth Proportional to 931.88, 1,285.61 and 558.74

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Solution

The fourth proportional to 931.88, 1,285.61 and 558.74 is: 770.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.88 : 1,285.61 = 558.74 : x
  2. Step 2: Convert to fraction form
    931.88/1,285.61 = 558.74/x
  3. Step 3: Cross multiply
    931.88x = 1,285.61 × 558.74
  4. Step 4: Simplify right side
    931.88x = 718,322.15
  5. Step 5: Solve for x
    x = 718,322.15/931.88
  6. Step 6: Final answer
    x = 770.83

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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.