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Finding the Fourth Proportional to 912.68, 1,259.94 and 691.76

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Solution

The fourth proportional to 912.68, 1,259.94 and 691.76 is: 954.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.68 : 1,259.94 = 691.76 : x
  2. Step 2: Convert to fraction form
    912.68/1,259.94 = 691.76/x
  3. Step 3: Cross multiply
    912.68x = 1,259.94 × 691.76
  4. Step 4: Simplify right side
    912.68x = 871,576.09
  5. Step 5: Solve for x
    x = 871,576.09/912.68
  6. Step 6: Final answer
    x = 954.96

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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.