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Finding the Fourth Proportional to 1,138.31, 1,565.93 and 928.02

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Solution

The fourth proportional to 1,138.31, 1,565.93 and 928.02 is: 1,276.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.31 : 1,565.93 = 928.02 : x
  2. Step 2: Convert to fraction form
    1,138.31/1,565.93 = 928.02/x
  3. Step 3: Cross multiply
    1,138.31x = 1,565.93 × 928.02
  4. Step 4: Simplify right side
    1,138.31x = 1,453,215.03
  5. Step 5: Solve for x
    x = 1,453,215.03/1,138.31
  6. Step 6: Final answer
    x = 1,276.64

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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.