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Finding the Fourth Proportional to 66,228.98, 99,346.90 and 21,859.19

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Solution

The fourth proportional to 66,228.98, 99,346.90 and 21,859.19 is: 32,789.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,228.98 : 99,346.90 = 21,859.19 : x
  2. Step 2: Convert to fraction form
    66,228.98/99,346.90 = 21,859.19/x
  3. Step 3: Cross multiply
    66,228.98x = 99,346.90 × 21,859.19
  4. Step 4: Simplify right side
    66,228.98x = 2,171,642,763.01
  5. Step 5: Solve for x
    x = 2,171,642,763.01/66,228.98
  6. Step 6: Final answer
    x = 32,789.92

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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.