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Finding the Fourth Proportional to 78,480.21, 116,981.01 and 72,181.65

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Solution

The fourth proportional to 78,480.21, 116,981.01 and 72,181.65 is: 107,592.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,480.21 : 116,981.01 = 72,181.65 : x
  2. Step 2: Convert to fraction form
    78,480.21/116,981.01 = 72,181.65/x
  3. Step 3: Cross multiply
    78,480.21x = 116,981.01 × 72,181.65
  4. Step 4: Simplify right side
    78,480.21x = 8,443,882,320.47
  5. Step 5: Solve for x
    x = 8,443,882,320.47/78,480.21
  6. Step 6: Final answer
    x = 107,592.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.