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Finding the Fourth Proportional to 60,782.76, 91,138.12 and 20,787.59

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Solution

The fourth proportional to 60,782.76, 91,138.12 and 20,787.59 is: 31,169.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,782.76 : 91,138.12 = 20,787.59 : x
  2. Step 2: Convert to fraction form
    60,782.76/91,138.12 = 20,787.59/x
  3. Step 3: Cross multiply
    60,782.76x = 91,138.12 × 20,787.59
  4. Step 4: Simplify right side
    60,782.76x = 1,894,542,047.81
  5. Step 5: Solve for x
    x = 1,894,542,047.81/60,782.76
  6. Step 6: Final answer
    x = 31,169.07

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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.