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Finding the Fourth Proportional to 618.75, 928.13 and 185.91

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Solution

The fourth proportional to 618.75, 928.13 and 185.91 is: 278.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.75 : 928.13 = 185.91 : x
  2. Step 2: Convert to fraction form
    618.75/928.13 = 185.91/x
  3. Step 3: Cross multiply
    618.75x = 928.13 × 185.91
  4. Step 4: Simplify right side
    618.75x = 172,547.72
  5. Step 5: Solve for x
    x = 172,547.72/618.75
  6. Step 6: Final answer
    x = 278.87

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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.