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Finding the Fourth Proportional to 1,087.50, 1,501.01 and 639.57

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Solution

The fourth proportional to 1,087.50, 1,501.01 and 639.57 is: 882.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.50 : 1,501.01 = 639.57 : x
  2. Step 2: Convert to fraction form
    1,087.50/1,501.01 = 639.57/x
  3. Step 3: Cross multiply
    1,087.50x = 1,501.01 × 639.57
  4. Step 4: Simplify right side
    1,087.50x = 960,000.97
  5. Step 5: Solve for x
    x = 960,000.97/1,087.50
  6. Step 6: Final answer
    x = 882.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.