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Finding the Fourth Proportional to 1,023.36, 1,531.20 and 916.80

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Solution

The fourth proportional to 1,023.36, 1,531.20 and 916.80 is: 1,371.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,023.36 : 1,531.20 = 916.80 : x
  2. Step 2: Convert to fraction form
    1,023.36/1,531.20 = 916.80/x
  3. Step 3: Cross multiply
    1,023.36x = 1,531.20 × 916.80
  4. Step 4: Simplify right side
    1,023.36x = 1,403,804.16
  5. Step 5: Solve for x
    x = 1,403,804.16/1,023.36
  6. Step 6: Final answer
    x = 1,371.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.