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Finding the Fourth Proportional to 66,632.40, 99,965.90 and 19,885.28

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Solution

The fourth proportional to 66,632.40, 99,965.90 and 19,885.28 is: 29,833.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,632.40 : 99,965.90 = 19,885.28 : x
  2. Step 2: Convert to fraction form
    66,632.40/99,965.90 = 19,885.28/x
  3. Step 3: Cross multiply
    66,632.40x = 99,965.90 × 19,885.28
  4. Step 4: Simplify right side
    66,632.40x = 1,987,849,312.70
  5. Step 5: Solve for x
    x = 1,987,849,312.70/66,632.40
  6. Step 6: Final answer
    x = 29,833.07

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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.