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Finding the Fourth Proportional to 749.92, 1,035.12 and 640.48

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Solution

The fourth proportional to 749.92, 1,035.12 and 640.48 is: 884.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.92 : 1,035.12 = 640.48 : x
  2. Step 2: Convert to fraction form
    749.92/1,035.12 = 640.48/x
  3. Step 3: Cross multiply
    749.92x = 1,035.12 × 640.48
  4. Step 4: Simplify right side
    749.92x = 662,973.66
  5. Step 5: Solve for x
    x = 662,973.66/749.92
  6. Step 6: Final answer
    x = 884.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.