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Finding the Fourth Proportional to 99,812.20, 149,791.20 and 70,287.70

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Solution

The fourth proportional to 99,812.20, 149,791.20 and 70,287.70 is: 105,482.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,812.20 : 149,791.20 = 70,287.70 : x
  2. Step 2: Convert to fraction form
    99,812.20/149,791.20 = 70,287.70/x
  3. Step 3: Cross multiply
    99,812.20x = 149,791.20 × 70,287.70
  4. Step 4: Simplify right side
    99,812.20x = 10,528,478,928.24
  5. Step 5: Solve for x
    x = 10,528,478,928.24/99,812.20
  6. Step 6: Final answer
    x = 105,482.89

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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.