Home / 21,420.80-32,131.20-18,140.30

Finding the Fourth Proportional to 21,420.80, 32,131.20 and 18,140.30

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Solution

The fourth proportional to 21,420.80, 32,131.20 and 18,140.30 is: 27,210.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,420.80 : 32,131.20 = 18,140.30 : x
  2. Step 2: Convert to fraction form
    21,420.80/32,131.20 = 18,140.30/x
  3. Step 3: Cross multiply
    21,420.80x = 32,131.20 × 18,140.30
  4. Step 4: Simplify right side
    21,420.80x = 582,869,607.36
  5. Step 5: Solve for x
    x = 582,869,607.36/21,420.80
  6. Step 6: Final answer
    x = 27,210.45

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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.