Home / 21,985.20-32,977.80-21,207.60

Finding the Fourth Proportional to 21,985.20, 32,977.80 and 21,207.60

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Solution

The fourth proportional to 21,985.20, 32,977.80 and 21,207.60 is: 31,811.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,985.20 : 32,977.80 = 21,207.60 : x
  2. Step 2: Convert to fraction form
    21,985.20/32,977.80 = 21,207.60/x
  3. Step 3: Cross multiply
    21,985.20x = 32,977.80 × 21,207.60
  4. Step 4: Simplify right side
    21,985.20x = 699,379,991.28
  5. Step 5: Solve for x
    x = 699,379,991.28/21,985.20
  6. Step 6: Final answer
    x = 31,811.40

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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.