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Finding the Fourth Proportional to 21,900.60, 32,853.30 and 21,209.40

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Solution

The fourth proportional to 21,900.60, 32,853.30 and 21,209.40 is: 31,816.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,900.60 : 32,853.30 = 21,209.40 : x
  2. Step 2: Convert to fraction form
    21,900.60/32,853.30 = 21,209.40/x
  3. Step 3: Cross multiply
    21,900.60x = 32,853.30 × 21,209.40
  4. Step 4: Simplify right side
    21,900.60x = 696,798,781.02
  5. Step 5: Solve for x
    x = 696,798,781.02/21,900.60
  6. Step 6: Final answer
    x = 31,816.42

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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.