Home / 21,987.20-30,342.12-13,602.08

Finding the Fourth Proportional to 21,987.20, 30,342.12 and 13,602.08

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Solution

The fourth proportional to 21,987.20, 30,342.12 and 13,602.08 is: 18,770.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,987.20 : 30,342.12 = 13,602.08 : x
  2. Step 2: Convert to fraction form
    21,987.20/30,342.12 = 13,602.08/x
  3. Step 3: Cross multiply
    21,987.20x = 30,342.12 × 13,602.08
  4. Step 4: Simplify right side
    21,987.20x = 412,715,943.61
  5. Step 5: Solve for x
    x = 412,715,943.61/21,987.20
  6. Step 6: Final answer
    x = 18,770.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.