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Finding the Fourth Proportional to 772.28, 1,065.80 and 440.72

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Solution

The fourth proportional to 772.28, 1,065.80 and 440.72 is: 608.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.28 : 1,065.80 = 440.72 : x
  2. Step 2: Convert to fraction form
    772.28/1,065.80 = 440.72/x
  3. Step 3: Cross multiply
    772.28x = 1,065.80 × 440.72
  4. Step 4: Simplify right side
    772.28x = 469,719.38
  5. Step 5: Solve for x
    x = 469,719.38/772.28
  6. Step 6: Final answer
    x = 608.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.