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Finding the Fourth Proportional to 994.72, 1,371.80 and 663.52

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Solution

The fourth proportional to 994.72, 1,371.80 and 663.52 is: 915.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.72 : 1,371.80 = 663.52 : x
  2. Step 2: Convert to fraction form
    994.72/1,371.80 = 663.52/x
  3. Step 3: Cross multiply
    994.72x = 1,371.80 × 663.52
  4. Step 4: Simplify right side
    994.72x = 910,216.74
  5. Step 5: Solve for x
    x = 910,216.74/994.72
  6. Step 6: Final answer
    x = 915.05

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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.