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Finding the Fourth Proportional to 949.60, 1,420.40 and 852.80

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Solution

The fourth proportional to 949.60, 1,420.40 and 852.80 is: 1,275.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.60 : 1,420.40 = 852.80 : x
  2. Step 2: Convert to fraction form
    949.60/1,420.40 = 852.80/x
  3. Step 3: Cross multiply
    949.60x = 1,420.40 × 852.80
  4. Step 4: Simplify right side
    949.60x = 1,211,317.12
  5. Step 5: Solve for x
    x = 1,211,317.12/949.60
  6. Step 6: Final answer
    x = 1,275.61

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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.