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Finding the Fourth Proportional to 72,203.88, 99,641.94 and 39,943.20

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Solution

The fourth proportional to 72,203.88, 99,641.94 and 39,943.20 is: 55,121.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,203.88 : 99,641.94 = 39,943.20 : x
  2. Step 2: Convert to fraction form
    72,203.88/99,641.94 = 39,943.20/x
  3. Step 3: Cross multiply
    72,203.88x = 99,641.94 × 39,943.20
  4. Step 4: Simplify right side
    72,203.88x = 3,980,017,937.81
  5. Step 5: Solve for x
    x = 3,980,017,937.81/72,203.88
  6. Step 6: Final answer
    x = 55,121.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.