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Finding the Fourth Proportional to 39,990.65, 55,186.90 and 22,085.57

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Solution

The fourth proportional to 39,990.65, 55,186.90 and 22,085.57 is: 30,477.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,990.65 : 55,186.90 = 22,085.57 : x
  2. Step 2: Convert to fraction form
    39,990.65/55,186.90 = 22,085.57/x
  3. Step 3: Cross multiply
    39,990.65x = 55,186.90 × 22,085.57
  4. Step 4: Simplify right side
    39,990.65x = 1,218,834,143.03
  5. Step 5: Solve for x
    x = 1,218,834,143.03/39,990.65
  6. Step 6: Final answer
    x = 30,477.98

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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.