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Finding the Fourth Proportional to 926.90, 1,272.85 and 779.29

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Solution

The fourth proportional to 926.90, 1,272.85 and 779.29 is: 1,070.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.90 : 1,272.85 = 779.29 : x
  2. Step 2: Convert to fraction form
    926.90/1,272.85 = 779.29/x
  3. Step 3: Cross multiply
    926.90x = 1,272.85 × 779.29
  4. Step 4: Simplify right side
    926.90x = 991,912.91
  5. Step 5: Solve for x
    x = 991,912.91/926.90
  6. Step 6: Final answer
    x = 1,070.14

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.