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Finding the Fourth Proportional to 66,240, 99,340.56 and 19,481.76

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Solution

The fourth proportional to 66,240, 99,340.56 and 19,481.76 is: 29,216.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,240 : 99,340.56 = 19,481.76 : x
  2. Step 2: Convert to fraction form
    66,240/99,340.56 = 19,481.76/x
  3. Step 3: Cross multiply
    66,240x = 99,340.56 × 19,481.76
  4. Step 4: Simplify right side
    66,240x = 1,935,328,948.19
  5. Step 5: Solve for x
    x = 1,935,328,948.19/66,240
  6. Step 6: Final answer
    x = 29,216.92

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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.