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Finding the Fourth Proportional to 751.36, 1,034.16 and 640.48

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Solution

The fourth proportional to 751.36, 1,034.16 and 640.48 is: 881.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.36 : 1,034.16 = 640.48 : x
  2. Step 2: Convert to fraction form
    751.36/1,034.16 = 640.48/x
  3. Step 3: Cross multiply
    751.36x = 1,034.16 × 640.48
  4. Step 4: Simplify right side
    751.36x = 662,358.80
  5. Step 5: Solve for x
    x = 662,358.80/751.36
  6. Step 6: Final answer
    x = 881.55

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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.