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Finding the Fourth Proportional to 1,691.18, 2,536.80 and 651.08

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Solution

The fourth proportional to 1,691.18, 2,536.80 and 651.08 is: 976.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,691.18 : 2,536.80 = 651.08 : x
  2. Step 2: Convert to fraction form
    1,691.18/2,536.80 = 651.08/x
  3. Step 3: Cross multiply
    1,691.18x = 2,536.80 × 651.08
  4. Step 4: Simplify right side
    1,691.18x = 1,651,659.74
  5. Step 5: Solve for x
    x = 1,651,659.74/1,691.18
  6. Step 6: Final answer
    x = 976.63

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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.