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Finding the Fourth Proportional to 1,172.51, 1,617.87 and 724.55

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Solution

The fourth proportional to 1,172.51, 1,617.87 and 724.55 is: 999.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.51 : 1,617.87 = 724.55 : x
  2. Step 2: Convert to fraction form
    1,172.51/1,617.87 = 724.55/x
  3. Step 3: Cross multiply
    1,172.51x = 1,617.87 × 724.55
  4. Step 4: Simplify right side
    1,172.51x = 1,172,222.34
  5. Step 5: Solve for x
    x = 1,172,222.34/1,172.51
  6. Step 6: Final answer
    x = 999.76

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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.