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Finding the Fourth Proportional to 15,238.80, 20,985.67 and 12,561.60

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Solution

The fourth proportional to 15,238.80, 20,985.67 and 12,561.60 is: 17,298.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,238.80 : 20,985.67 = 12,561.60 : x
  2. Step 2: Convert to fraction form
    15,238.80/20,985.67 = 12,561.60/x
  3. Step 3: Cross multiply
    15,238.80x = 20,985.67 × 12,561.60
  4. Step 4: Simplify right side
    15,238.80x = 263,613,497.97
  5. Step 5: Solve for x
    x = 263,613,497.97/15,238.80
  6. Step 6: Final answer
    x = 17,298.84

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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.