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Finding the Fourth Proportional to 671.80, 1,005.42 and 498.76

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Solution

The fourth proportional to 671.80, 1,005.42 and 498.76 is: 746.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.80 : 1,005.42 = 498.76 : x
  2. Step 2: Convert to fraction form
    671.80/1,005.42 = 498.76/x
  3. Step 3: Cross multiply
    671.80x = 1,005.42 × 498.76
  4. Step 4: Simplify right side
    671.80x = 501,463.28
  5. Step 5: Solve for x
    x = 501,463.28/671.80
  6. Step 6: Final answer
    x = 746.45

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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.