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Finding the Fourth Proportional to 2,487.79, 3,729.80 and 2,145.16

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Solution

The fourth proportional to 2,487.79, 3,729.80 and 2,145.16 is: 3,216.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,487.79 : 3,729.80 = 2,145.16 : x
  2. Step 2: Convert to fraction form
    2,487.79/3,729.80 = 2,145.16/x
  3. Step 3: Cross multiply
    2,487.79x = 3,729.80 × 2,145.16
  4. Step 4: Simplify right side
    2,487.79x = 8,001,017.77
  5. Step 5: Solve for x
    x = 8,001,017.77/2,487.79
  6. Step 6: Final answer
    x = 3,216.11

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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.