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Finding the Fourth Proportional to 928.48, 1,392.78 and 312.16

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Solution

The fourth proportional to 928.48, 1,392.78 and 312.16 is: 468.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.48 : 1,392.78 = 312.16 : x
  2. Step 2: Convert to fraction form
    928.48/1,392.78 = 312.16/x
  3. Step 3: Cross multiply
    928.48x = 1,392.78 × 312.16
  4. Step 4: Simplify right side
    928.48x = 434,770.20
  5. Step 5: Solve for x
    x = 434,770.20/928.48
  6. Step 6: Final answer
    x = 468.26

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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.