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Finding the Fourth Proportional to 155,039.16, 213,955.50 and 87,965.88

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Solution

The fourth proportional to 155,039.16, 213,955.50 and 87,965.88 is: 121,393.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,039.16 : 213,955.50 = 87,965.88 : x
  2. Step 2: Convert to fraction form
    155,039.16/213,955.50 = 87,965.88/x
  3. Step 3: Cross multiply
    155,039.16x = 213,955.50 × 87,965.88
  4. Step 4: Simplify right side
    155,039.16x = 18,820,783,838.34
  5. Step 5: Solve for x
    x = 18,820,783,838.34/155,039.16
  6. Step 6: Final answer
    x = 121,393.74

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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.