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Finding the Fourth Proportional to 618.86, 928.28 and 156.63

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Solution

The fourth proportional to 618.86, 928.28 and 156.63 is: 234.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.86 : 928.28 = 156.63 : x
  2. Step 2: Convert to fraction form
    618.86/928.28 = 156.63/x
  3. Step 3: Cross multiply
    618.86x = 928.28 × 156.63
  4. Step 4: Simplify right side
    618.86x = 145,396.89
  5. Step 5: Solve for x
    x = 145,396.89/618.86
  6. Step 6: Final answer
    x = 234.95

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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.