Home / 19,985.05-29,966.56-8,135.79

Finding the Fourth Proportional to 19,985.05, 29,966.56 and 8,135.79

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Solution

The fourth proportional to 19,985.05, 29,966.56 and 8,135.79 is: 12,199.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,985.05 : 29,966.56 = 8,135.79 : x
  2. Step 2: Convert to fraction form
    19,985.05/29,966.56 = 8,135.79/x
  3. Step 3: Cross multiply
    19,985.05x = 29,966.56 × 8,135.79
  4. Step 4: Simplify right side
    19,985.05x = 243,801,634.10
  5. Step 5: Solve for x
    x = 243,801,634.10/19,985.05
  6. Step 6: Final answer
    x = 12,199.20

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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.