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Finding the Fourth Proportional to 749.61, 1,124.99 and 489.54

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Solution

The fourth proportional to 749.61, 1,124.99 and 489.54 is: 734.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.61 : 1,124.99 = 489.54 : x
  2. Step 2: Convert to fraction form
    749.61/1,124.99 = 489.54/x
  3. Step 3: Cross multiply
    749.61x = 1,124.99 × 489.54
  4. Step 4: Simplify right side
    749.61x = 550,719.53
  5. Step 5: Solve for x
    x = 550,719.53/749.61
  6. Step 6: Final answer
    x = 734.68

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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.