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Finding the Fourth Proportional to 1,149.06, 1,585 and 928.30

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Solution

The fourth proportional to 1,149.06, 1,585 and 928.30 is: 1,280.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,149.06 : 1,585 = 928.30 : x
  2. Step 2: Convert to fraction form
    1,149.06/1,585 = 928.30/x
  3. Step 3: Cross multiply
    1,149.06x = 1,585 × 928.30
  4. Step 4: Simplify right side
    1,149.06x = 1,471,355.50
  5. Step 5: Solve for x
    x = 1,471,355.50/1,149.06
  6. Step 6: Final answer
    x = 1,280.49

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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.