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Finding the Fourth Proportional to 901.67, 1,349.56 and 489.78

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Solution

The fourth proportional to 901.67, 1,349.56 and 489.78 is: 733.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.67 : 1,349.56 = 489.78 : x
  2. Step 2: Convert to fraction form
    901.67/1,349.56 = 489.78/x
  3. Step 3: Cross multiply
    901.67x = 1,349.56 × 489.78
  4. Step 4: Simplify right side
    901.67x = 660,987.50
  5. Step 5: Solve for x
    x = 660,987.50/901.67
  6. Step 6: Final answer
    x = 733.07

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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.