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Finding the Fourth Proportional to 66,921.75, 100,421.52 and 29,985.75

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Solution

The fourth proportional to 66,921.75, 100,421.52 and 29,985.75 is: 44,996.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,921.75 : 100,421.52 = 29,985.75 : x
  2. Step 2: Convert to fraction form
    66,921.75/100,421.52 = 29,985.75/x
  3. Step 3: Cross multiply
    66,921.75x = 100,421.52 × 29,985.75
  4. Step 4: Simplify right side
    66,921.75x = 3,011,214,593.34
  5. Step 5: Solve for x
    x = 3,011,214,593.34/66,921.75
  6. Step 6: Final answer
    x = 44,996.05

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1.5x scale

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.