Home / 20,275.11-27,980.15-12,721.77

Finding the Fourth Proportional to 20,275.11, 27,980.15 and 12,721.77

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Solution

The fourth proportional to 20,275.11, 27,980.15 and 12,721.77 is: 17,556.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,275.11 : 27,980.15 = 12,721.77 : x
  2. Step 2: Convert to fraction form
    20,275.11/27,980.15 = 12,721.77/x
  3. Step 3: Cross multiply
    20,275.11x = 27,980.15 × 12,721.77
  4. Step 4: Simplify right side
    20,275.11x = 355,956,969.26
  5. Step 5: Solve for x
    x = 355,956,969.26/20,275.11
  6. Step 6: Final answer
    x = 17,556.35

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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.