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Finding the Fourth Proportional to 928.66, 1,393.18 and 279.40

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Solution

The fourth proportional to 928.66, 1,393.18 and 279.40 is: 419.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.66 : 1,393.18 = 279.40 : x
  2. Step 2: Convert to fraction form
    928.66/1,393.18 = 279.40/x
  3. Step 3: Cross multiply
    928.66x = 1,393.18 × 279.40
  4. Step 4: Simplify right side
    928.66x = 389,254.49
  5. Step 5: Solve for x
    x = 389,254.49/928.66
  6. Step 6: Final answer
    x = 419.16

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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.