Home / 21,678.78-32,517.70-9,991.99

Finding the Fourth Proportional to 21,678.78, 32,517.70 and 9,991.99

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Solution

The fourth proportional to 21,678.78, 32,517.70 and 9,991.99 is: 14,987.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,678.78 : 32,517.70 = 9,991.99 : x
  2. Step 2: Convert to fraction form
    21,678.78/32,517.70 = 9,991.99/x
  3. Step 3: Cross multiply
    21,678.78x = 32,517.70 × 9,991.99
  4. Step 4: Simplify right side
    21,678.78x = 324,916,533.22
  5. Step 5: Solve for x
    x = 324,916,533.22/21,678.78
  6. Step 6: Final answer
    x = 14,987.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.