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Finding the Fourth Proportional to 155,015.11, 213,904.32 and 87,039.50

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Solution

The fourth proportional to 155,015.11, 213,904.32 and 87,039.50 is: 120,105.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,015.11 : 213,904.32 = 87,039.50 : x
  2. Step 2: Convert to fraction form
    155,015.11/213,904.32 = 87,039.50/x
  3. Step 3: Cross multiply
    155,015.11x = 213,904.32 × 87,039.50
  4. Step 4: Simplify right side
    155,015.11x = 18,618,125,060.64
  5. Step 5: Solve for x
    x = 18,618,125,060.64/155,015.11
  6. Step 6: Final answer
    x = 120,105.23

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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.