Home / 20,816.50-31,235-9,721.58

Finding the Fourth Proportional to 20,816.50, 31,235 and 9,721.58

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Solution

The fourth proportional to 20,816.50, 31,235 and 9,721.58 is: 14,587.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,816.50 : 31,235 = 9,721.58 : x
  2. Step 2: Convert to fraction form
    20,816.50/31,235 = 9,721.58/x
  3. Step 3: Cross multiply
    20,816.50x = 31,235 × 9,721.58
  4. Step 4: Simplify right side
    20,816.50x = 303,653,551.30
  5. Step 5: Solve for x
    x = 303,653,551.30/20,816.50
  6. Step 6: Final answer
    x = 14,587.16

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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.