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Finding the Fourth Proportional to 750.87, 1,036.08 and 685.26

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Solution

The fourth proportional to 750.87, 1,036.08 and 685.26 is: 945.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.87 : 1,036.08 = 685.26 : x
  2. Step 2: Convert to fraction form
    750.87/1,036.08 = 685.26/x
  3. Step 3: Cross multiply
    750.87x = 1,036.08 × 685.26
  4. Step 4: Simplify right side
    750.87x = 709,984.18
  5. Step 5: Solve for x
    x = 709,984.18/750.87
  6. Step 6: Final answer
    x = 945.55

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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.