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Finding the Fourth Proportional to 890.61, 1,229.01 and 497.61

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Solution

The fourth proportional to 890.61, 1,229.01 and 497.61 is: 686.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.61 : 1,229.01 = 497.61 : x
  2. Step 2: Convert to fraction form
    890.61/1,229.01 = 497.61/x
  3. Step 3: Cross multiply
    890.61x = 1,229.01 × 497.61
  4. Step 4: Simplify right side
    890.61x = 611,567.67
  5. Step 5: Solve for x
    x = 611,567.67/890.61
  6. Step 6: Final answer
    x = 686.68

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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.