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Finding the Third Proportional to 987.50 and 2,139

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Solution

The third proportional to 987.50 and 2,139 is: 4,633.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.50 : 2,139 = 2,139 : x
  2. Step 2: Convert to fraction form
    987.50/2,139 = 2,139/x
  3. Step 3: Cross multiply
    987.50x = 2,139 × 2,139
  4. Step 4: Simplify right side
    987.50x = 4,575,321
  5. Step 5: Solve for x
    x = 4,575,321/987.50
  6. Step 6: Final answer
    x = 4,633.24

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.