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Finding the Fourth Proportional to 20,888.40, 31,332.60 and 18,069.60

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Solution

The fourth proportional to 20,888.40, 31,332.60 and 18,069.60 is: 27,104.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,888.40 : 31,332.60 = 18,069.60 : x
  2. Step 2: Convert to fraction form
    20,888.40/31,332.60 = 18,069.60/x
  3. Step 3: Cross multiply
    20,888.40x = 31,332.60 × 18,069.60
  4. Step 4: Simplify right side
    20,888.40x = 566,167,548.96
  5. Step 5: Solve for x
    x = 566,167,548.96/20,888.40
  6. Step 6: Final answer
    x = 27,104.40

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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.