Home / 20,920.77-31,384.61-10,391.14

Finding the Fourth Proportional to 20,920.77, 31,384.61 and 10,391.14

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Solution

The fourth proportional to 20,920.77, 31,384.61 and 10,391.14 is: 15,588.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.77 : 31,384.61 = 10,391.14 : x
  2. Step 2: Convert to fraction form
    20,920.77/31,384.61 = 10,391.14/x
  3. Step 3: Cross multiply
    20,920.77x = 31,384.61 × 10,391.14
  4. Step 4: Simplify right side
    20,920.77x = 326,121,667.48
  5. Step 5: Solve for x
    x = 326,121,667.48/20,920.77
  6. Step 6: Final answer
    x = 15,588.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.