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Finding the Fourth Proportional to 1,011.68, 1,395.66 and 679.76

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Solution

The fourth proportional to 1,011.68, 1,395.66 and 679.76 is: 937.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.68 : 1,395.66 = 679.76 : x
  2. Step 2: Convert to fraction form
    1,011.68/1,395.66 = 679.76/x
  3. Step 3: Cross multiply
    1,011.68x = 1,395.66 × 679.76
  4. Step 4: Simplify right side
    1,011.68x = 948,713.84
  5. Step 5: Solve for x
    x = 948,713.84/1,011.68
  6. Step 6: Final answer
    x = 937.76

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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.