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Finding the Fourth Proportional to 72,219.60, 99,660.96 and 39,955.53

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Solution

The fourth proportional to 72,219.60, 99,660.96 and 39,955.53 is: 55,137.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,219.60 : 99,660.96 = 39,955.53 : x
  2. Step 2: Convert to fraction form
    72,219.60/99,660.96 = 39,955.53/x
  3. Step 3: Cross multiply
    72,219.60x = 99,660.96 × 39,955.53
  4. Step 4: Simplify right side
    72,219.60x = 3,982,006,477.11
  5. Step 5: Solve for x
    x = 3,982,006,477.11/72,219.60
  6. Step 6: Final answer
    x = 55,137.48

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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.