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Finding the Fourth Proportional to 751.78, 1,125.28 and 489.68

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Solution

The fourth proportional to 751.78, 1,125.28 and 489.68 is: 732.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.78 : 1,125.28 = 489.68 : x
  2. Step 2: Convert to fraction form
    751.78/1,125.28 = 489.68/x
  3. Step 3: Cross multiply
    751.78x = 1,125.28 × 489.68
  4. Step 4: Simplify right side
    751.78x = 551,030.37
  5. Step 5: Solve for x
    x = 551,030.37/751.78
  6. Step 6: Final answer
    x = 732.97

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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.