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Finding the Fourth Proportional to 99,813.70, 149,720.55 and 80,130.70

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Solution

The fourth proportional to 99,813.70, 149,720.55 and 80,130.70 is: 120,196.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,813.70 : 149,720.55 = 80,130.70 : x
  2. Step 2: Convert to fraction form
    99,813.70/149,720.55 = 80,130.70/x
  3. Step 3: Cross multiply
    99,813.70x = 149,720.55 × 80,130.70
  4. Step 4: Simplify right side
    99,813.70x = 11,997,212,475.89
  5. Step 5: Solve for x
    x = 11,997,212,475.89/99,813.70
  6. Step 6: Final answer
    x = 120,196.05

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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.