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Finding the Fourth Proportional to 21,340.16, 29,456.16 and 20,225.60

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Solution

The fourth proportional to 21,340.16, 29,456.16 and 20,225.60 is: 27,917.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,340.16 : 29,456.16 = 20,225.60 : x
  2. Step 2: Convert to fraction form
    21,340.16/29,456.16 = 20,225.60/x
  3. Step 3: Cross multiply
    21,340.16x = 29,456.16 × 20,225.60
  4. Step 4: Simplify right side
    21,340.16x = 595,768,509.70
  5. Step 5: Solve for x
    x = 595,768,509.70/21,340.16
  6. Step 6: Final answer
    x = 27,917.72

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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.