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Finding the Fourth Proportional to 928.20, 1,392.18 and 351

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Solution

The fourth proportional to 928.20, 1,392.18 and 351 is: 526.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.20 : 1,392.18 = 351 : x
  2. Step 2: Convert to fraction form
    928.20/1,392.18 = 351/x
  3. Step 3: Cross multiply
    928.20x = 1,392.18 × 351
  4. Step 4: Simplify right side
    928.20x = 488,655.18
  5. Step 5: Solve for x
    x = 488,655.18/928.20
  6. Step 6: Final answer
    x = 526.45

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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.