Home / 39,684.78-54,764.28-21,780

Finding the Fourth Proportional to 39,684.78, 54,764.28 and 21,780

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Solution

The fourth proportional to 39,684.78, 54,764.28 and 21,780 is: 30,056.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,684.78 : 54,764.28 = 21,780 : x
  2. Step 2: Convert to fraction form
    39,684.78/54,764.28 = 21,780/x
  3. Step 3: Cross multiply
    39,684.78x = 54,764.28 × 21,780
  4. Step 4: Simplify right side
    39,684.78x = 1,192,766,018.40
  5. Step 5: Solve for x
    x = 1,192,766,018.40/39,684.78
  6. Step 6: Final answer
    x = 30,056.01

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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.