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Finding the Fourth Proportional to 21,405.80, 32,108.70 and 19,656.20

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Solution

The fourth proportional to 21,405.80, 32,108.70 and 19,656.20 is: 29,484.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,405.80 : 32,108.70 = 19,656.20 : x
  2. Step 2: Convert to fraction form
    21,405.80/32,108.70 = 19,656.20/x
  3. Step 3: Cross multiply
    21,405.80x = 32,108.70 × 19,656.20
  4. Step 4: Simplify right side
    21,405.80x = 631,135,028.94
  5. Step 5: Solve for x
    x = 631,135,028.94/21,405.80
  6. Step 6: Final answer
    x = 29,484.30

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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.