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Finding the Fourth Proportional to 21,000.87, 28,978.56 and 11,570.04

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Solution

The fourth proportional to 21,000.87, 28,978.56 and 11,570.04 is: 15,965.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.87 : 28,978.56 = 11,570.04 : x
  2. Step 2: Convert to fraction form
    21,000.87/28,978.56 = 11,570.04/x
  3. Step 3: Cross multiply
    21,000.87x = 28,978.56 × 11,570.04
  4. Step 4: Simplify right side
    21,000.87x = 335,283,098.34
  5. Step 5: Solve for x
    x = 335,283,098.34/21,000.87
  6. Step 6: Final answer
    x = 15,965.20

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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.