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Finding the Fourth Proportional to 21,064.85, 31,600.51 and 7,918.14

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Solution

The fourth proportional to 21,064.85, 31,600.51 and 7,918.14 is: 11,878.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,064.85 : 31,600.51 = 7,918.14 : x
  2. Step 2: Convert to fraction form
    21,064.85/31,600.51 = 7,918.14/x
  3. Step 3: Cross multiply
    21,064.85x = 31,600.51 × 7,918.14
  4. Step 4: Simplify right side
    21,064.85x = 250,217,242.46
  5. Step 5: Solve for x
    x = 250,217,242.46/21,064.85
  6. Step 6: Final answer
    x = 11,878.43

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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.