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Finding the Fourth Proportional to 861.58, 1,292.18 and 245.28

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Solution

The fourth proportional to 861.58, 1,292.18 and 245.28 is: 367.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.58 : 1,292.18 = 245.28 : x
  2. Step 2: Convert to fraction form
    861.58/1,292.18 = 245.28/x
  3. Step 3: Cross multiply
    861.58x = 1,292.18 × 245.28
  4. Step 4: Simplify right side
    861.58x = 316,940.01
  5. Step 5: Solve for x
    x = 316,940.01/861.58
  6. Step 6: Final answer
    x = 367.86

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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.