Home / 20,920.65-31,380.87-9,827.28

Finding the Fourth Proportional to 20,920.65, 31,380.87 and 9,827.28

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Solution

The fourth proportional to 20,920.65, 31,380.87 and 9,827.28 is: 14,740.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.65 : 31,380.87 = 9,827.28 : x
  2. Step 2: Convert to fraction form
    20,920.65/31,380.87 = 9,827.28/x
  3. Step 3: Cross multiply
    20,920.65x = 31,380.87 × 9,827.28
  4. Step 4: Simplify right side
    20,920.65x = 308,388,596.13
  5. Step 5: Solve for x
    x = 308,388,596.13/20,920.65
  6. Step 6: Final answer
    x = 14,740.87

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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.