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Finding the Fourth Proportional to 686.95, 1,030.31 and 225.06

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Solution

The fourth proportional to 686.95, 1,030.31 and 225.06 is: 337.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.95 : 1,030.31 = 225.06 : x
  2. Step 2: Convert to fraction form
    686.95/1,030.31 = 225.06/x
  3. Step 3: Cross multiply
    686.95x = 1,030.31 × 225.06
  4. Step 4: Simplify right side
    686.95x = 231,881.57
  5. Step 5: Solve for x
    x = 231,881.57/686.95
  6. Step 6: Final answer
    x = 337.55

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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.