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Finding the Fourth Proportional to 131,314.80, 196,972.20 and 78,697.20

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Solution

The fourth proportional to 131,314.80, 196,972.20 and 78,697.20 is: 118,045.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,314.80 : 196,972.20 = 78,697.20 : x
  2. Step 2: Convert to fraction form
    131,314.80/196,972.20 = 78,697.20/x
  3. Step 3: Cross multiply
    131,314.80x = 196,972.20 × 78,697.20
  4. Step 4: Simplify right side
    131,314.80x = 15,501,160,617.84
  5. Step 5: Solve for x
    x = 15,501,160,617.84/131,314.80
  6. Step 6: Final answer
    x = 118,045.80

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1.5x scale

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.