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Finding the Fourth Proportional to 864.22, 1,191.69 and 615.45

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Solution

The fourth proportional to 864.22, 1,191.69 and 615.45 is: 848.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.22 : 1,191.69 = 615.45 : x
  2. Step 2: Convert to fraction form
    864.22/1,191.69 = 615.45/x
  3. Step 3: Cross multiply
    864.22x = 1,191.69 × 615.45
  4. Step 4: Simplify right side
    864.22x = 733,421.65
  5. Step 5: Solve for x
    x = 733,421.65/864.22
  6. Step 6: Final answer
    x = 848.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.