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Finding the Fourth Proportional to 749.50, 1,029.96 and 715.20

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Solution

The fourth proportional to 749.50, 1,029.96 and 715.20 is: 982.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.50 : 1,029.96 = 715.20 : x
  2. Step 2: Convert to fraction form
    749.50/1,029.96 = 715.20/x
  3. Step 3: Cross multiply
    749.50x = 1,029.96 × 715.20
  4. Step 4: Simplify right side
    749.50x = 736,627.39
  5. Step 5: Solve for x
    x = 736,627.39/749.50
  6. Step 6: Final answer
    x = 982.83

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.