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Finding the Fourth Proportional to 1,317.62, 1,818.28 and 728.18

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Solution

The fourth proportional to 1,317.62, 1,818.28 and 728.18 is: 1,004.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.62 : 1,818.28 = 728.18 : x
  2. Step 2: Convert to fraction form
    1,317.62/1,818.28 = 728.18/x
  3. Step 3: Cross multiply
    1,317.62x = 1,818.28 × 728.18
  4. Step 4: Simplify right side
    1,317.62x = 1,324,035.13
  5. Step 5: Solve for x
    x = 1,324,035.13/1,317.62
  6. Step 6: Final answer
    x = 1,004.87

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1.5x scale

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.