Home / 20,810.31-28,721.42-13,259.94

Finding the Fourth Proportional to 20,810.31, 28,721.42 and 13,259.94

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Solution

The fourth proportional to 20,810.31, 28,721.42 and 13,259.94 is: 18,300.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.31 : 28,721.42 = 13,259.94 : x
  2. Step 2: Convert to fraction form
    20,810.31/28,721.42 = 13,259.94/x
  3. Step 3: Cross multiply
    20,810.31x = 28,721.42 × 13,259.94
  4. Step 4: Simplify right side
    20,810.31x = 380,844,305.91
  5. Step 5: Solve for x
    x = 380,844,305.91/20,810.31
  6. Step 6: Final answer
    x = 18,300.75

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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.