Home / 1,172.18-1,617.40-724.30

Finding the Fourth Proportional to 1,172.18, 1,617.40 and 724.30

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Solution

The fourth proportional to 1,172.18, 1,617.40 and 724.30 is: 999.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.18 : 1,617.40 = 724.30 : x
  2. Step 2: Convert to fraction form
    1,172.18/1,617.40 = 724.30/x
  3. Step 3: Cross multiply
    1,172.18x = 1,617.40 × 724.30
  4. Step 4: Simplify right side
    1,172.18x = 1,171,476.97
  5. Step 5: Solve for x
    x = 1,171,476.97/1,172.18
  6. Step 6: Final answer
    x = 999.40

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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.