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Finding the Fourth Proportional to 934.11, 1,287.54 and 685.04

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Solution

The fourth proportional to 934.11, 1,287.54 and 685.04 is: 944.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.11 : 1,287.54 = 685.04 : x
  2. Step 2: Convert to fraction form
    934.11/1,287.54 = 685.04/x
  3. Step 3: Cross multiply
    934.11x = 1,287.54 × 685.04
  4. Step 4: Simplify right side
    934.11x = 882,009.96
  5. Step 5: Solve for x
    x = 882,009.96/934.11
  6. Step 6: Final answer
    x = 944.22

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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.