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Finding the Fourth Proportional to 20,291.16, 28,005 and 12,335.88

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Solution

The fourth proportional to 20,291.16, 28,005 and 12,335.88 is: 17,025.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,291.16 : 28,005 = 12,335.88 : x
  2. Step 2: Convert to fraction form
    20,291.16/28,005 = 12,335.88/x
  3. Step 3: Cross multiply
    20,291.16x = 28,005 × 12,335.88
  4. Step 4: Simplify right side
    20,291.16x = 345,466,319.40
  5. Step 5: Solve for x
    x = 345,466,319.40/20,291.16
  6. Step 6: Final answer
    x = 17,025.46

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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.