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Finding the Fourth Proportional to 66,471.60, 99,673.20 and 19,718.40

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Solution

The fourth proportional to 66,471.60, 99,673.20 and 19,718.40 is: 29,567.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,471.60 : 99,673.20 = 19,718.40 : x
  2. Step 2: Convert to fraction form
    66,471.60/99,673.20 = 19,718.40/x
  3. Step 3: Cross multiply
    66,471.60x = 99,673.20 × 19,718.40
  4. Step 4: Simplify right side
    66,471.60x = 1,965,396,026.88
  5. Step 5: Solve for x
    x = 1,965,396,026.88/66,471.60
  6. Step 6: Final answer
    x = 29,567.45

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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.