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Finding the Fourth Proportional to 99,803.40, 149,744.70 and 40,643.40

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Solution

The fourth proportional to 99,803.40, 149,744.70 and 40,643.40 is: 60,981.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,803.40 : 149,744.70 = 40,643.40 : x
  2. Step 2: Convert to fraction form
    99,803.40/149,744.70 = 40,643.40/x
  3. Step 3: Cross multiply
    99,803.40x = 149,744.70 × 40,643.40
  4. Step 4: Simplify right side
    99,803.40x = 6,086,133,739.98
  5. Step 5: Solve for x
    x = 6,086,133,739.98/99,803.40
  6. Step 6: Final answer
    x = 60,981.23

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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.