Home / 20,590.70-28,415.20-11,159.18

Finding the Fourth Proportional to 20,590.70, 28,415.20 and 11,159.18

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Solution

The fourth proportional to 20,590.70, 28,415.20 and 11,159.18 is: 15,399.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,590.70 : 28,415.20 = 11,159.18 : x
  2. Step 2: Convert to fraction form
    20,590.70/28,415.20 = 11,159.18/x
  3. Step 3: Cross multiply
    20,590.70x = 28,415.20 × 11,159.18
  4. Step 4: Simplify right side
    20,590.70x = 317,090,331.54
  5. Step 5: Solve for x
    x = 317,090,331.54/20,590.70
  6. Step 6: Final answer
    x = 15,399.69

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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.