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Finding the Fourth Proportional to 718.13, 1,078.17 and 371.72

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Solution

The fourth proportional to 718.13, 1,078.17 and 371.72 is: 558.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.13 : 1,078.17 = 371.72 : x
  2. Step 2: Convert to fraction form
    718.13/1,078.17 = 371.72/x
  3. Step 3: Cross multiply
    718.13x = 1,078.17 × 371.72
  4. Step 4: Simplify right side
    718.13x = 400,771.96
  5. Step 5: Solve for x
    x = 400,771.96/718.13
  6. Step 6: Final answer
    x = 558.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.