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Finding the Fourth Proportional to 99,671.72, 149,507.58 and 68,412.20

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Solution

The fourth proportional to 99,671.72, 149,507.58 and 68,412.20 is: 102,618.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,671.72 : 149,507.58 = 68,412.20 : x
  2. Step 2: Convert to fraction form
    99,671.72/149,507.58 = 68,412.20/x
  3. Step 3: Cross multiply
    99,671.72x = 149,507.58 × 68,412.20
  4. Step 4: Simplify right side
    99,671.72x = 10,228,142,464.48
  5. Step 5: Solve for x
    x = 10,228,142,464.48/99,671.72
  6. Step 6: Final answer
    x = 102,618.30

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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.