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Finding the Fourth Proportional to 932.85, 1,287.28 and 685.21

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Solution

The fourth proportional to 932.85, 1,287.28 and 685.21 is: 945.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.85 : 1,287.28 = 685.21 : x
  2. Step 2: Convert to fraction form
    932.85/1,287.28 = 685.21/x
  3. Step 3: Cross multiply
    932.85x = 1,287.28 × 685.21
  4. Step 4: Simplify right side
    932.85x = 882,057.13
  5. Step 5: Solve for x
    x = 882,057.13/932.85
  6. Step 6: Final answer
    x = 945.55

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1.5x scale

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.