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Finding the Fourth Proportional to 1,138.80, 1,708.20 and 944.40

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Solution

The fourth proportional to 1,138.80, 1,708.20 and 944.40 is: 1,416.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.80 : 1,708.20 = 944.40 : x
  2. Step 2: Convert to fraction form
    1,138.80/1,708.20 = 944.40/x
  3. Step 3: Cross multiply
    1,138.80x = 1,708.20 × 944.40
  4. Step 4: Simplify right side
    1,138.80x = 1,613,224.08
  5. Step 5: Solve for x
    x = 1,613,224.08/1,138.80
  6. Step 6: Final answer
    x = 1,416.60

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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.