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Finding the Fourth Proportional to 100,854.51, 151,099.25 and 72,621.70

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Solution

The fourth proportional to 100,854.51, 151,099.25 and 72,621.70 is: 108,801.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,854.51 : 151,099.25 = 72,621.70 : x
  2. Step 2: Convert to fraction form
    100,854.51/151,099.25 = 72,621.70/x
  3. Step 3: Cross multiply
    100,854.51x = 151,099.25 × 72,621.70
  4. Step 4: Simplify right side
    100,854.51x = 10,973,084,403.73
  5. Step 5: Solve for x
    x = 10,973,084,403.73/100,854.51
  6. Step 6: Final answer
    x = 108,801.13

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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.