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Finding the Fourth Proportional to 1,720.30, 2,576.24 and 987.66

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Solution

The fourth proportional to 1,720.30, 2,576.24 and 987.66 is: 1,479.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.30 : 2,576.24 = 987.66 : x
  2. Step 2: Convert to fraction form
    1,720.30/2,576.24 = 987.66/x
  3. Step 3: Cross multiply
    1,720.30x = 2,576.24 × 987.66
  4. Step 4: Simplify right side
    1,720.30x = 2,544,449.20
  5. Step 5: Solve for x
    x = 2,544,449.20/1,720.30
  6. Step 6: Final answer
    x = 1,479.07

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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.