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Finding the Fourth Proportional to 687, 1,030.66 and 231

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Solution

The fourth proportional to 687, 1,030.66 and 231 is: 346.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    687 : 1,030.66 = 231 : x
  2. Step 2: Convert to fraction form
    687/1,030.66 = 231/x
  3. Step 3: Cross multiply
    687x = 1,030.66 × 231
  4. Step 4: Simplify right side
    687x = 238,082.46
  5. Step 5: Solve for x
    x = 238,082.46/687
  6. Step 6: Final answer
    x = 346.55

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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.