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Finding the Fourth Proportional to 750.72, 1,036.07 and 640.16

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Solution

The fourth proportional to 750.72, 1,036.07 and 640.16 is: 883.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.72 : 1,036.07 = 640.16 : x
  2. Step 2: Convert to fraction form
    750.72/1,036.07 = 640.16/x
  3. Step 3: Cross multiply
    750.72x = 1,036.07 × 640.16
  4. Step 4: Simplify right side
    750.72x = 663,250.57
  5. Step 5: Solve for x
    x = 663,250.57/750.72
  6. Step 6: Final answer
    x = 883.49

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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.