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Finding the Fourth Proportional to 39,404.78, 54,378.78 and 21,500.17

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Solution

The fourth proportional to 39,404.78, 54,378.78 and 21,500.17 is: 29,670.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,404.78 : 54,378.78 = 21,500.17 : x
  2. Step 2: Convert to fraction form
    39,404.78/54,378.78 = 21,500.17/x
  3. Step 3: Cross multiply
    39,404.78x = 54,378.78 × 21,500.17
  4. Step 4: Simplify right side
    39,404.78x = 1,169,152,878.45
  5. Step 5: Solve for x
    x = 1,169,152,878.45/39,404.78
  6. Step 6: Final answer
    x = 29,670.33

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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.