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Finding the Fourth Proportional to 685.58, 1,027.13 and 424.76

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Solution

The fourth proportional to 685.58, 1,027.13 and 424.76 is: 636.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.58 : 1,027.13 = 424.76 : x
  2. Step 2: Convert to fraction form
    685.58/1,027.13 = 424.76/x
  3. Step 3: Cross multiply
    685.58x = 1,027.13 × 424.76
  4. Step 4: Simplify right side
    685.58x = 436,276.48
  5. Step 5: Solve for x
    x = 436,276.48/685.58
  6. Step 6: Final answer
    x = 636.37

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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.