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Finding the Fourth Proportional to 99,987.96, 149,709.60 and 70,361.40

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Solution

The fourth proportional to 99,987.96, 149,709.60 and 70,361.40 is: 105,350.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,987.96 : 149,709.60 = 70,361.40 : x
  2. Step 2: Convert to fraction form
    99,987.96/149,709.60 = 70,361.40/x
  3. Step 3: Cross multiply
    99,987.96x = 149,709.60 × 70,361.40
  4. Step 4: Simplify right side
    99,987.96x = 10,533,777,049.44
  5. Step 5: Solve for x
    x = 10,533,777,049.44/99,987.96
  6. Step 6: Final answer
    x = 105,350.45

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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.