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Finding the Fourth Proportional to 928.75, 1,393.14 and 279.46

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Solution

The fourth proportional to 928.75, 1,393.14 and 279.46 is: 419.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.75 : 1,393.14 = 279.46 : x
  2. Step 2: Convert to fraction form
    928.75/1,393.14 = 279.46/x
  3. Step 3: Cross multiply
    928.75x = 1,393.14 × 279.46
  4. Step 4: Simplify right side
    928.75x = 389,326.90
  5. Step 5: Solve for x
    x = 389,326.90/928.75
  6. Step 6: Final answer
    x = 419.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.