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Finding the Fourth Proportional to 21,894.80, 32,842.20 and 13,139.60

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Solution

The fourth proportional to 21,894.80, 32,842.20 and 13,139.60 is: 19,709.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,894.80 : 32,842.20 = 13,139.60 : x
  2. Step 2: Convert to fraction form
    21,894.80/32,842.20 = 13,139.60/x
  3. Step 3: Cross multiply
    21,894.80x = 32,842.20 × 13,139.60
  4. Step 4: Simplify right side
    21,894.80x = 431,533,371.12
  5. Step 5: Solve for x
    x = 431,533,371.12/21,894.80
  6. Step 6: Final answer
    x = 19,709.40

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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.