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Finding the Fourth Proportional to 718.20, 1,077.90 and 328.80

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Solution

The fourth proportional to 718.20, 1,077.90 and 328.80 is: 493.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.20 : 1,077.90 = 328.80 : x
  2. Step 2: Convert to fraction form
    718.20/1,077.90 = 328.80/x
  3. Step 3: Cross multiply
    718.20x = 1,077.90 × 328.80
  4. Step 4: Simplify right side
    718.20x = 354,413.52
  5. Step 5: Solve for x
    x = 354,413.52/718.20
  6. Step 6: Final answer
    x = 493.47

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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.