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Finding the Fourth Proportional to 20,388.80, 30,575.86 and 7,058.18

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Solution

The fourth proportional to 20,388.80, 30,575.86 and 7,058.18 is: 10,584.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.80 : 30,575.86 = 7,058.18 : x
  2. Step 2: Convert to fraction form
    20,388.80/30,575.86 = 7,058.18/x
  3. Step 3: Cross multiply
    20,388.80x = 30,575.86 × 7,058.18
  4. Step 4: Simplify right side
    20,388.80x = 215,809,735.36
  5. Step 5: Solve for x
    x = 215,809,735.36/20,388.80
  6. Step 6: Final answer
    x = 10,584.72

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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.