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Finding the Fourth Proportional to 928.80, 1,282.14 and 666.36

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Solution

The fourth proportional to 928.80, 1,282.14 and 666.36 is: 919.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.80 : 1,282.14 = 666.36 : x
  2. Step 2: Convert to fraction form
    928.80/1,282.14 = 666.36/x
  3. Step 3: Cross multiply
    928.80x = 1,282.14 × 666.36
  4. Step 4: Simplify right side
    928.80x = 854,366.81
  5. Step 5: Solve for x
    x = 854,366.81/928.80
  6. Step 6: Final answer
    x = 919.86

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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.