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Finding the Fourth Proportional to 39,480.50, 54,483.09 and 21,816.50

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Solution

The fourth proportional to 39,480.50, 54,483.09 and 21,816.50 is: 30,106.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,480.50 : 54,483.09 = 21,816.50 : x
  2. Step 2: Convert to fraction form
    39,480.50/54,483.09 = 21,816.50/x
  3. Step 3: Cross multiply
    39,480.50x = 54,483.09 × 21,816.50
  4. Step 4: Simplify right side
    39,480.50x = 1,188,630,332.99
  5. Step 5: Solve for x
    x = 1,188,630,332.99/39,480.50
  6. Step 6: Final answer
    x = 30,106.77

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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.