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Finding the Fourth Proportional to 1,808.72, 2,711.48 and 782.16

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Solution

The fourth proportional to 1,808.72, 2,711.48 and 782.16 is: 1,172.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,808.72 : 2,711.48 = 782.16 : x
  2. Step 2: Convert to fraction form
    1,808.72/2,711.48 = 782.16/x
  3. Step 3: Cross multiply
    1,808.72x = 2,711.48 × 782.16
  4. Step 4: Simplify right side
    1,808.72x = 2,120,811.20
  5. Step 5: Solve for x
    x = 2,120,811.20/1,808.72
  6. Step 6: Final answer
    x = 1,172.55

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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.