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Finding the Fourth Proportional to 718.95, 1,078.56 and 354.18

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Solution

The fourth proportional to 718.95, 1,078.56 and 354.18 is: 531.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.95 : 1,078.56 = 354.18 : x
  2. Step 2: Convert to fraction form
    718.95/1,078.56 = 354.18/x
  3. Step 3: Cross multiply
    718.95x = 1,078.56 × 354.18
  4. Step 4: Simplify right side
    718.95x = 382,004.38
  5. Step 5: Solve for x
    x = 382,004.38/718.95
  6. Step 6: Final answer
    x = 531.34

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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.