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Finding the Fourth Proportional to 851.40, 1,275.30 and 760.20

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Solution

The fourth proportional to 851.40, 1,275.30 and 760.20 is: 1,138.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.40 : 1,275.30 = 760.20 : x
  2. Step 2: Convert to fraction form
    851.40/1,275.30 = 760.20/x
  3. Step 3: Cross multiply
    851.40x = 1,275.30 × 760.20
  4. Step 4: Simplify right side
    851.40x = 969,483.06
  5. Step 5: Solve for x
    x = 969,483.06/851.40
  6. Step 6: Final answer
    x = 1,138.69

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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.