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Finding the Fourth Proportional to 931.55, 1,285.39 and 558.45

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Solution

The fourth proportional to 931.55, 1,285.39 and 558.45 is: 770.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.55 : 1,285.39 = 558.45 : x
  2. Step 2: Convert to fraction form
    931.55/1,285.39 = 558.45/x
  3. Step 3: Cross multiply
    931.55x = 1,285.39 × 558.45
  4. Step 4: Simplify right side
    931.55x = 717,826.05
  5. Step 5: Solve for x
    x = 717,826.05/931.55
  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.