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Finding the Fourth Proportional to 72,099.12, 108,149.40 and 19,509.12

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Solution

The fourth proportional to 72,099.12, 108,149.40 and 19,509.12 is: 29,263.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,099.12 : 108,149.40 = 19,509.12 : x
  2. Step 2: Convert to fraction form
    72,099.12/108,149.40 = 19,509.12/x
  3. Step 3: Cross multiply
    72,099.12x = 108,149.40 × 19,509.12
  4. Step 4: Simplify right side
    72,099.12x = 2,109,899,622.53
  5. Step 5: Solve for x
    x = 2,109,899,622.53/72,099.12
  6. Step 6: Final answer
    x = 29,263.87

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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.