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Finding the Fourth Proportional to 935.15, 1,288.51 and 672.71

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Solution

The fourth proportional to 935.15, 1,288.51 and 672.71 is: 926.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.15 : 1,288.51 = 672.71 : x
  2. Step 2: Convert to fraction form
    935.15/1,288.51 = 672.71/x
  3. Step 3: Cross multiply
    935.15x = 1,288.51 × 672.71
  4. Step 4: Simplify right side
    935.15x = 866,785.44
  5. Step 5: Solve for x
    x = 866,785.44/935.15
  6. Step 6: Final answer
    x = 926.90

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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.