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Finding the Fourth Proportional to 1,679.24, 2,518.47 and 638.87

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Solution

The fourth proportional to 1,679.24, 2,518.47 and 638.87 is: 958.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.24 : 2,518.47 = 638.87 : x
  2. Step 2: Convert to fraction form
    1,679.24/2,518.47 = 638.87/x
  3. Step 3: Cross multiply
    1,679.24x = 2,518.47 × 638.87
  4. Step 4: Simplify right side
    1,679.24x = 1,608,962.34
  5. Step 5: Solve for x
    x = 1,608,962.34/1,679.24
  6. Step 6: Final answer
    x = 958.15

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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.