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Finding the Fourth Proportional to 782.13, 1,173.45 and 489.82

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Solution

The fourth proportional to 782.13, 1,173.45 and 489.82 is: 734.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.13 : 1,173.45 = 489.82 : x
  2. Step 2: Convert to fraction form
    782.13/1,173.45 = 489.82/x
  3. Step 3: Cross multiply
    782.13x = 1,173.45 × 489.82
  4. Step 4: Simplify right side
    782.13x = 574,776.83
  5. Step 5: Solve for x
    x = 574,776.83/782.13
  6. Step 6: Final answer
    x = 734.89

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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.