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Finding the Fourth Proportional to 20,279.88, 30,420 and 7,132.36

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Solution

The fourth proportional to 20,279.88, 30,420 and 7,132.36 is: 10,698.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,279.88 : 30,420 = 7,132.36 : x
  2. Step 2: Convert to fraction form
    20,279.88/30,420 = 7,132.36/x
  3. Step 3: Cross multiply
    20,279.88x = 30,420 × 7,132.36
  4. Step 4: Simplify right side
    20,279.88x = 216,966,391.20
  5. Step 5: Solve for x
    x = 216,966,391.20/20,279.88
  6. Step 6: Final answer
    x = 10,698.60

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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.