Home / 21,985.76-32,884.40-20,390.34

Finding the Fourth Proportional to 21,985.76, 32,884.40 and 20,390.34

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Solution

The fourth proportional to 21,985.76, 32,884.40 and 20,390.34 is: 30,498.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,985.76 : 32,884.40 = 20,390.34 : x
  2. Step 2: Convert to fraction form
    21,985.76/32,884.40 = 20,390.34/x
  3. Step 3: Cross multiply
    21,985.76x = 32,884.40 × 20,390.34
  4. Step 4: Simplify right side
    21,985.76x = 670,523,994.74
  5. Step 5: Solve for x
    x = 670,523,994.74/21,985.76
  6. Step 6: Final answer
    x = 30,498.11

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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.