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Finding the Fourth Proportional to 72,962.21, 100,687.85 and 39,428.21

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Solution

The fourth proportional to 72,962.21, 100,687.85 and 39,428.21 is: 54,410.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,962.21 : 100,687.85 = 39,428.21 : x
  2. Step 2: Convert to fraction form
    72,962.21/100,687.85 = 39,428.21/x
  3. Step 3: Cross multiply
    72,962.21x = 100,687.85 × 39,428.21
  4. Step 4: Simplify right side
    72,962.21x = 3,969,941,694.25
  5. Step 5: Solve for x
    x = 3,969,941,694.25/72,962.21
  6. Step 6: Final answer
    x = 54,410.93

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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.