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Finding the Fourth Proportional to 1,099.79, 1,517.70 and 602.40

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Solution

The fourth proportional to 1,099.79, 1,517.70 and 602.40 is: 831.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.79 : 1,517.70 = 602.40 : x
  2. Step 2: Convert to fraction form
    1,099.79/1,517.70 = 602.40/x
  3. Step 3: Cross multiply
    1,099.79x = 1,517.70 × 602.40
  4. Step 4: Simplify right side
    1,099.79x = 914,262.48
  5. Step 5: Solve for x
    x = 914,262.48/1,099.79
  6. Step 6: Final answer
    x = 831.31

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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.