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Finding the Fourth Proportional to 1,161.28, 1,602.48 and 663.90

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Solution

The fourth proportional to 1,161.28, 1,602.48 and 663.90 is: 916.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.28 : 1,602.48 = 663.90 : x
  2. Step 2: Convert to fraction form
    1,161.28/1,602.48 = 663.90/x
  3. Step 3: Cross multiply
    1,161.28x = 1,602.48 × 663.90
  4. Step 4: Simplify right side
    1,161.28x = 1,063,886.47
  5. Step 5: Solve for x
    x = 1,063,886.47/1,161.28
  6. Step 6: Final answer
    x = 916.13

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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.