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Finding the Fourth Proportional to 898.77, 1,239.95 and 663.28

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Solution

The fourth proportional to 898.77, 1,239.95 and 663.28 is: 915.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.77 : 1,239.95 = 663.28 : x
  2. Step 2: Convert to fraction form
    898.77/1,239.95 = 663.28/x
  3. Step 3: Cross multiply
    898.77x = 1,239.95 × 663.28
  4. Step 4: Simplify right side
    898.77x = 822,432.59
  5. Step 5: Solve for x
    x = 822,432.59/898.77
  6. Step 6: Final answer
    x = 915.06

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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.