Home / 21,405.60-32,108.40-13,111.20

Finding the Fourth Proportional to 21,405.60, 32,108.40 and 13,111.20

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Solution

The fourth proportional to 21,405.60, 32,108.40 and 13,111.20 is: 19,666.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,405.60 : 32,108.40 = 13,111.20 : x
  2. Step 2: Convert to fraction form
    21,405.60/32,108.40 = 13,111.20/x
  3. Step 3: Cross multiply
    21,405.60x = 32,108.40 × 13,111.20
  4. Step 4: Simplify right side
    21,405.60x = 420,979,654.08
  5. Step 5: Solve for x
    x = 420,979,654.08/21,405.60
  6. Step 6: Final answer
    x = 19,666.80

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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.