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Finding the Fourth Proportional to 949.42, 1,421.18 and 868.68

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Solution

The fourth proportional to 949.42, 1,421.18 and 868.68 is: 1,300.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.42 : 1,421.18 = 868.68 : x
  2. Step 2: Convert to fraction form
    949.42/1,421.18 = 868.68/x
  3. Step 3: Cross multiply
    949.42x = 1,421.18 × 868.68
  4. Step 4: Simplify right side
    949.42x = 1,234,543.54
  5. Step 5: Solve for x
    x = 1,234,543.54/949.42
  6. Step 6: Final answer
    x = 1,300.32

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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.