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Finding the Fourth Proportional to 72,172.53, 99,594.06 and 39,905.28

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Solution

The fourth proportional to 72,172.53, 99,594.06 and 39,905.28 is: 55,067.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,172.53 : 99,594.06 = 39,905.28 : x
  2. Step 2: Convert to fraction form
    72,172.53/99,594.06 = 39,905.28/x
  3. Step 3: Cross multiply
    72,172.53x = 99,594.06 × 39,905.28
  4. Step 4: Simplify right side
    72,172.53x = 3,974,328,850.64
  5. Step 5: Solve for x
    x = 3,974,328,850.64/72,172.53
  6. Step 6: Final answer
    x = 55,067.06

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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.