Home / 39,880.25-55,031.30-21,970.85

Finding the Fourth Proportional to 39,880.25, 55,031.30 and 21,970.85

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Solution

The fourth proportional to 39,880.25, 55,031.30 and 21,970.85 is: 30,317.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,880.25 : 55,031.30 = 21,970.85 : x
  2. Step 2: Convert to fraction form
    39,880.25/55,031.30 = 21,970.85/x
  3. Step 3: Cross multiply
    39,880.25x = 55,031.30 × 21,970.85
  4. Step 4: Simplify right side
    39,880.25x = 1,209,084,134.98
  5. Step 5: Solve for x
    x = 1,209,084,134.98/39,880.25
  6. Step 6: Final answer
    x = 30,317.87

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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.