Home / 21,216.86-31,816.62-9,209.78

Finding the Fourth Proportional to 21,216.86, 31,816.62 and 9,209.78

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Solution

The fourth proportional to 21,216.86, 31,816.62 and 9,209.78 is: 13,810.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,216.86 : 31,816.62 = 9,209.78 : x
  2. Step 2: Convert to fraction form
    21,216.86/31,816.62 = 9,209.78/x
  3. Step 3: Cross multiply
    21,216.86x = 31,816.62 × 9,209.78
  4. Step 4: Simplify right side
    21,216.86x = 293,024,070.54
  5. Step 5: Solve for x
    x = 293,024,070.54/21,216.86
  6. Step 6: Final answer
    x = 13,810.91

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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.