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Finding the Fourth Proportional to 1,613.76, 2,419.56 and 921.20

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Solution

The fourth proportional to 1,613.76, 2,419.56 and 921.20 is: 1,381.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,613.76 : 2,419.56 = 921.20 : x
  2. Step 2: Convert to fraction form
    1,613.76/2,419.56 = 921.20/x
  3. Step 3: Cross multiply
    1,613.76x = 2,419.56 × 921.20
  4. Step 4: Simplify right side
    1,613.76x = 2,228,898.67
  5. Step 5: Solve for x
    x = 2,228,898.67/1,613.76
  6. Step 6: Final answer
    x = 1,381.18

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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.