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Finding the Fourth Proportional to 39,880.76, 55,037.90 and 21,975.76

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Solution

The fourth proportional to 39,880.76, 55,037.90 and 21,975.76 is: 30,327.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,880.76 : 55,037.90 = 21,975.76 : x
  2. Step 2: Convert to fraction form
    39,880.76/55,037.90 = 21,975.76/x
  3. Step 3: Cross multiply
    39,880.76x = 55,037.90 × 21,975.76
  4. Step 4: Simplify right side
    39,880.76x = 1,209,499,296.24
  5. Step 5: Solve for x
    x = 1,209,499,296.24/39,880.76
  6. Step 6: Final answer
    x = 30,327.89

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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.