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Finding the Fourth Proportional to 20,590.69, 28,415.25 and 11,159.25

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Solution

The fourth proportional to 20,590.69, 28,415.25 and 11,159.25 is: 15,399.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,590.69 : 28,415.25 = 11,159.25 : x
  2. Step 2: Convert to fraction form
    20,590.69/28,415.25 = 11,159.25/x
  3. Step 3: Cross multiply
    20,590.69x = 28,415.25 × 11,159.25
  4. Step 4: Simplify right side
    20,590.69x = 317,092,878.56
  5. Step 5: Solve for x
    x = 317,092,878.56/20,590.69
  6. Step 6: Final answer
    x = 15,399.82

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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.