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Finding the Fourth Proportional to 66,636.72, 99,905.16 and 40,335.12

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Solution

The fourth proportional to 66,636.72, 99,905.16 and 40,335.12 is: 60,472.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,636.72 : 99,905.16 = 40,335.12 : x
  2. Step 2: Convert to fraction form
    66,636.72/99,905.16 = 40,335.12/x
  3. Step 3: Cross multiply
    66,636.72x = 99,905.16 × 40,335.12
  4. Step 4: Simplify right side
    66,636.72x = 4,029,686,617.22
  5. Step 5: Solve for x
    x = 4,029,686,617.22/66,636.72
  6. Step 6: Final answer
    x = 60,472.46

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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.