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Finding the Fourth Proportional to 718.52, 1,077.90 and 645.96

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Solution

The fourth proportional to 718.52, 1,077.90 and 645.96 is: 969.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.52 : 1,077.90 = 645.96 : x
  2. Step 2: Convert to fraction form
    718.52/1,077.90 = 645.96/x
  3. Step 3: Cross multiply
    718.52x = 1,077.90 × 645.96
  4. Step 4: Simplify right side
    718.52x = 696,280.28
  5. Step 5: Solve for x
    x = 696,280.28/718.52
  6. Step 6: Final answer
    x = 969.05

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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.