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Finding the Fourth Proportional to 72,938.80, 100,655.52 and 39,404.80

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Solution

The fourth proportional to 72,938.80, 100,655.52 and 39,404.80 is: 54,378.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,938.80 : 100,655.52 = 39,404.80 : x
  2. Step 2: Convert to fraction form
    72,938.80/100,655.52 = 39,404.80/x
  3. Step 3: Cross multiply
    72,938.80x = 100,655.52 × 39,404.80
  4. Step 4: Simplify right side
    72,938.80x = 3,966,310,634.50
  5. Step 5: Solve for x
    x = 3,966,310,634.50/72,938.80
  6. Step 6: Final answer
    x = 54,378.61

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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.