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Finding the Fourth Proportional to 779.08, 1,165.02 and 761.80

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Solution

The fourth proportional to 779.08, 1,165.02 and 761.80 is: 1,139.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.08 : 1,165.02 = 761.80 : x
  2. Step 2: Convert to fraction form
    779.08/1,165.02 = 761.80/x
  3. Step 3: Cross multiply
    779.08x = 1,165.02 × 761.80
  4. Step 4: Simplify right side
    779.08x = 887,512.24
  5. Step 5: Solve for x
    x = 887,512.24/779.08
  6. Step 6: Final answer
    x = 1,139.18

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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.