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Finding the Fourth Proportional to 5,154, 7,731 and 1,691.25

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Solution

The fourth proportional to 5,154, 7,731 and 1,691.25 is: 2,536.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,154 : 7,731 = 1,691.25 : x
  2. Step 2: Convert to fraction form
    5,154/7,731 = 1,691.25/x
  3. Step 3: Cross multiply
    5,154x = 7,731 × 1,691.25
  4. Step 4: Simplify right side
    5,154x = 13,075,053.75
  5. Step 5: Solve for x
    x = 13,075,053.75/5,154
  6. Step 6: Final answer
    x = 2,536.88

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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.