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Finding the Fourth Proportional to 931.46, 1,285.31 and 558.43

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Solution

The fourth proportional to 931.46, 1,285.31 and 558.43 is: 770.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.46 : 1,285.31 = 558.43 : x
  2. Step 2: Convert to fraction form
    931.46/1,285.31 = 558.43/x
  3. Step 3: Cross multiply
    931.46x = 1,285.31 × 558.43
  4. Step 4: Simplify right side
    931.46x = 717,749.24
  5. Step 5: Solve for x
    x = 717,749.24/931.46
  6. Step 6: Final answer
    x = 770.57

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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.