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Finding the Fourth Proportional to 1,138.50, 1,708.11 and 625.86

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Solution

The fourth proportional to 1,138.50, 1,708.11 and 625.86 is: 938.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.50 : 1,708.11 = 625.86 : x
  2. Step 2: Convert to fraction form
    1,138.50/1,708.11 = 625.86/x
  3. Step 3: Cross multiply
    1,138.50x = 1,708.11 × 625.86
  4. Step 4: Simplify right side
    1,138.50x = 1,069,037.72
  5. Step 5: Solve for x
    x = 1,069,037.72/1,138.50
  6. Step 6: Final answer
    x = 938.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.