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Finding the Fourth Proportional to 39,803.80, 54,928.08 and 21,898.80

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Solution

The fourth proportional to 39,803.80, 54,928.08 and 21,898.80 is: 30,219.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,803.80 : 54,928.08 = 21,898.80 : x
  2. Step 2: Convert to fraction form
    39,803.80/54,928.08 = 21,898.80/x
  3. Step 3: Cross multiply
    39,803.80x = 54,928.08 × 21,898.80
  4. Step 4: Simplify right side
    39,803.80x = 1,202,859,038.30
  5. Step 5: Solve for x
    x = 1,202,859,038.30/39,803.80
  6. Step 6: Final answer
    x = 30,219.70

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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.