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Finding the Fourth Proportional to 928.61, 1,393.14 and 312.32

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Solution

The fourth proportional to 928.61, 1,393.14 and 312.32 is: 468.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.61 : 1,393.14 = 312.32 : x
  2. Step 2: Convert to fraction form
    928.61/1,393.14 = 312.32/x
  3. Step 3: Cross multiply
    928.61x = 1,393.14 × 312.32
  4. Step 4: Simplify right side
    928.61x = 435,098.52
  5. Step 5: Solve for x
    x = 435,098.52/928.61
  6. Step 6: Final answer
    x = 468.55

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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.