Home / 20,740.90-31,111.35-12,849.70

Finding the Fourth Proportional to 20,740.90, 31,111.35 and 12,849.70

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Solution

The fourth proportional to 20,740.90, 31,111.35 and 12,849.70 is: 19,274.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,740.90 : 31,111.35 = 12,849.70 : x
  2. Step 2: Convert to fraction form
    20,740.90/31,111.35 = 12,849.70/x
  3. Step 3: Cross multiply
    20,740.90x = 31,111.35 × 12,849.70
  4. Step 4: Simplify right side
    20,740.90x = 399,771,514.10
  5. Step 5: Solve for x
    x = 399,771,514.10/20,740.90
  6. Step 6: Final answer
    x = 19,274.55

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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.