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Finding the Fourth Proportional to 949.40, 1,421.40 and 852.20

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Solution

The fourth proportional to 949.40, 1,421.40 and 852.20 is: 1,275.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.40 : 1,421.40 = 852.20 : x
  2. Step 2: Convert to fraction form
    949.40/1,421.40 = 852.20/x
  3. Step 3: Cross multiply
    949.40x = 1,421.40 × 852.20
  4. Step 4: Simplify right side
    949.40x = 1,211,317.08
  5. Step 5: Solve for x
    x = 1,211,317.08/949.40
  6. Step 6: Final answer
    x = 1,275.88

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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.