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Finding the Fourth Proportional to 72,225.88, 99,669.87 and 39,959.68

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Solution

The fourth proportional to 72,225.88, 99,669.87 and 39,959.68 is: 55,143.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,225.88 : 99,669.87 = 39,959.68 : x
  2. Step 2: Convert to fraction form
    72,225.88/99,669.87 = 39,959.68/x
  3. Step 3: Cross multiply
    72,225.88x = 99,669.87 × 39,959.68
  4. Step 4: Simplify right side
    72,225.88x = 3,982,776,110.84
  5. Step 5: Solve for x
    x = 3,982,776,110.84/72,225.88
  6. Step 6: Final answer
    x = 55,143.34

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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.