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Finding the Fourth Proportional to 207,430.80, 311,146.20 and 74,315.40

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Solution

The fourth proportional to 207,430.80, 311,146.20 and 74,315.40 is: 111,473.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,430.80 : 311,146.20 = 74,315.40 : x
  2. Step 2: Convert to fraction form
    207,430.80/311,146.20 = 74,315.40/x
  3. Step 3: Cross multiply
    207,430.80x = 311,146.20 × 74,315.40
  4. Step 4: Simplify right side
    207,430.80x = 23,122,954,311.48
  5. Step 5: Solve for x
    x = 23,122,954,311.48/207,430.80
  6. Step 6: Final answer
    x = 111,473.10

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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.