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Finding the Fourth Proportional to 875.17, 1,318.75 and 724.48

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Solution

The fourth proportional to 875.17, 1,318.75 and 724.48 is: 1,091.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.17 : 1,318.75 = 724.48 : x
  2. Step 2: Convert to fraction form
    875.17/1,318.75 = 724.48/x
  3. Step 3: Cross multiply
    875.17x = 1,318.75 × 724.48
  4. Step 4: Simplify right side
    875.17x = 955,403.22
  5. Step 5: Solve for x
    x = 955,403.22/875.17
  6. Step 6: Final answer
    x = 1,091.68

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.