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Finding the Fourth Proportional to 20,321.78, 27,985.55 and 16,752.17

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Solution

The fourth proportional to 20,321.78, 27,985.55 and 16,752.17 is: 23,069.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,321.78 : 27,985.55 = 16,752.17 : x
  2. Step 2: Convert to fraction form
    20,321.78/27,985.55 = 16,752.17/x
  3. Step 3: Cross multiply
    20,321.78x = 27,985.55 × 16,752.17
  4. Step 4: Simplify right side
    20,321.78x = 468,818,677.35
  5. Step 5: Solve for x
    x = 468,818,677.35/20,321.78
  6. Step 6: Final answer
    x = 23,069.77

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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.