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Finding the Fourth Proportional to 749.79, 1,125.09 and 747.50

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Solution

The fourth proportional to 749.79, 1,125.09 and 747.50 is: 1,121.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.79 : 1,125.09 = 747.50 : x
  2. Step 2: Convert to fraction form
    749.79/1,125.09 = 747.50/x
  3. Step 3: Cross multiply
    749.79x = 1,125.09 × 747.50
  4. Step 4: Simplify right side
    749.79x = 840,999.15
  5. Step 5: Solve for x
    x = 840,999.15/749.79
  6. Step 6: Final answer
    x = 1,121.65

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Double scale
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1.5x scale

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.