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Finding the Fourth Proportional to 102,713.20, 154,069.80 and 71,220.40

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Solution

The fourth proportional to 102,713.20, 154,069.80 and 71,220.40 is: 106,830.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,713.20 : 154,069.80 = 71,220.40 : x
  2. Step 2: Convert to fraction form
    102,713.20/154,069.80 = 71,220.40/x
  3. Step 3: Cross multiply
    102,713.20x = 154,069.80 × 71,220.40
  4. Step 4: Simplify right side
    102,713.20x = 10,972,912,783.92
  5. Step 5: Solve for x
    x = 10,972,912,783.92/102,713.20
  6. Step 6: Final answer
    x = 106,830.60

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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.