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Finding the Fourth Proportional to 72,940.80, 100,658.28 and 39,406.80

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Solution

The fourth proportional to 72,940.80, 100,658.28 and 39,406.80 is: 54,381.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,940.80 : 100,658.28 = 39,406.80 : x
  2. Step 2: Convert to fraction form
    72,940.80/100,658.28 = 39,406.80/x
  3. Step 3: Cross multiply
    72,940.80x = 100,658.28 × 39,406.80
  4. Step 4: Simplify right side
    72,940.80x = 3,966,620,708.30
  5. Step 5: Solve for x
    x = 3,966,620,708.30/72,940.80
  6. Step 6: Final answer
    x = 54,381.37

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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.