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Finding the Fourth Proportional to 151,459.20, 209,020.80 and 87,816.96

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Solution

The fourth proportional to 151,459.20, 209,020.80 and 87,816.96 is: 121,191.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    151,459.20 : 209,020.80 = 87,816.96 : x
  2. Step 2: Convert to fraction form
    151,459.20/209,020.80 = 87,816.96/x
  3. Step 3: Cross multiply
    151,459.20x = 209,020.80 × 87,816.96
  4. Step 4: Simplify right side
    151,459.20x = 18,355,571,232.77
  5. Step 5: Solve for x
    x = 18,355,571,232.77/151,459.20
  6. Step 6: Final answer
    x = 121,191.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.