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Finding the Fourth Proportional to 864.03, 1,290.18 and 679.35

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Solution

The fourth proportional to 864.03, 1,290.18 and 679.35 is: 1,014.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.03 : 1,290.18 = 679.35 : x
  2. Step 2: Convert to fraction form
    864.03/1,290.18 = 679.35/x
  3. Step 3: Cross multiply
    864.03x = 1,290.18 × 679.35
  4. Step 4: Simplify right side
    864.03x = 876,483.78
  5. Step 5: Solve for x
    x = 876,483.78/864.03
  6. Step 6: Final answer
    x = 1,014.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.