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Finding the Fourth Proportional to 772.60, 1,159.80 and 767.20

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Solution

The fourth proportional to 772.60, 1,159.80 and 767.20 is: 1,151.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.60 : 1,159.80 = 767.20 : x
  2. Step 2: Convert to fraction form
    772.60/1,159.80 = 767.20/x
  3. Step 3: Cross multiply
    772.60x = 1,159.80 × 767.20
  4. Step 4: Simplify right side
    772.60x = 889,798.56
  5. Step 5: Solve for x
    x = 889,798.56/772.60
  6. Step 6: Final answer
    x = 1,151.69

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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.