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Finding the Fourth Proportional to 981.12, 1,352.52 and 685.47

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Solution

The fourth proportional to 981.12, 1,352.52 and 685.47 is: 944.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.12 : 1,352.52 = 685.47 : x
  2. Step 2: Convert to fraction form
    981.12/1,352.52 = 685.47/x
  3. Step 3: Cross multiply
    981.12x = 1,352.52 × 685.47
  4. Step 4: Simplify right side
    981.12x = 927,111.88
  5. Step 5: Solve for x
    x = 927,111.88/981.12
  6. Step 6: Final answer
    x = 944.95

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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.