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Finding the Fourth Proportional to 1,215.53, 1,677.24 and 718.10

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Solution

The fourth proportional to 1,215.53, 1,677.24 and 718.10 is: 990.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.53 : 1,677.24 = 718.10 : x
  2. Step 2: Convert to fraction form
    1,215.53/1,677.24 = 718.10/x
  3. Step 3: Cross multiply
    1,215.53x = 1,677.24 × 718.10
  4. Step 4: Simplify right side
    1,215.53x = 1,204,426.04
  5. Step 5: Solve for x
    x = 1,204,426.04/1,215.53
  6. Step 6: Final answer
    x = 990.86

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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.