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Finding the Fourth Proportional to 928.14, 1,392.72 and 415.14

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Solution

The fourth proportional to 928.14, 1,392.72 and 415.14 is: 622.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.14 : 1,392.72 = 415.14 : x
  2. Step 2: Convert to fraction form
    928.14/1,392.72 = 415.14/x
  3. Step 3: Cross multiply
    928.14x = 1,392.72 × 415.14
  4. Step 4: Simplify right side
    928.14x = 578,173.78
  5. Step 5: Solve for x
    x = 578,173.78/928.14
  6. Step 6: Final answer
    x = 622.94

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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.