Home / 39,840.18-54,981.72-21,939

Finding the Fourth Proportional to 39,840.18, 54,981.72 and 21,939

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Solution

The fourth proportional to 39,840.18, 54,981.72 and 21,939 is: 30,277.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,840.18 : 54,981.72 = 21,939 : x
  2. Step 2: Convert to fraction form
    39,840.18/54,981.72 = 21,939/x
  3. Step 3: Cross multiply
    39,840.18x = 54,981.72 × 21,939
  4. Step 4: Simplify right side
    39,840.18x = 1,206,243,955.08
  5. Step 5: Solve for x
    x = 1,206,243,955.08/39,840.18
  6. Step 6: Final answer
    x = 30,277.07

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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.