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Finding the Fourth Proportional to 890.61, 1,228.85 and 681.02

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Solution

The fourth proportional to 890.61, 1,228.85 and 681.02 is: 939.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.61 : 1,228.85 = 681.02 : x
  2. Step 2: Convert to fraction form
    890.61/1,228.85 = 681.02/x
  3. Step 3: Cross multiply
    890.61x = 1,228.85 × 681.02
  4. Step 4: Simplify right side
    890.61x = 836,869.04
  5. Step 5: Solve for x
    x = 836,869.04/890.61
  6. Step 6: Final answer
    x = 939.66

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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.