Home / 39,890.62-55,046.80-21,985.57

Finding the Fourth Proportional to 39,890.62, 55,046.80 and 21,985.57

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Solution

The fourth proportional to 39,890.62, 55,046.80 and 21,985.57 is: 30,338.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,890.62 : 55,046.80 = 21,985.57 : x
  2. Step 2: Convert to fraction form
    39,890.62/55,046.80 = 21,985.57/x
  3. Step 3: Cross multiply
    39,890.62x = 55,046.80 × 21,985.57
  4. Step 4: Simplify right side
    39,890.62x = 1,210,235,274.68
  5. Step 5: Solve for x
    x = 1,210,235,274.68/39,890.62
  6. Step 6: Final answer
    x = 30,338.84

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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.