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Finding the Fourth Proportional to 842.13, 1,261.58 and 688.23

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Solution

The fourth proportional to 842.13, 1,261.58 and 688.23 is: 1,031.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.13 : 1,261.58 = 688.23 : x
  2. Step 2: Convert to fraction form
    842.13/1,261.58 = 688.23/x
  3. Step 3: Cross multiply
    842.13x = 1,261.58 × 688.23
  4. Step 4: Simplify right side
    842.13x = 868,253.76
  5. Step 5: Solve for x
    x = 868,253.76/842.13
  6. Step 6: Final answer
    x = 1,031.02

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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.