Home / 20,756.90-31,143.14-12,442.84

Finding the Fourth Proportional to 20,756.90, 31,143.14 and 12,442.84

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Solution

The fourth proportional to 20,756.90, 31,143.14 and 12,442.84 is: 18,668.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,756.90 : 31,143.14 = 12,442.84 : x
  2. Step 2: Convert to fraction form
    20,756.90/31,143.14 = 12,442.84/x
  3. Step 3: Cross multiply
    20,756.90x = 31,143.14 × 12,442.84
  4. Step 4: Simplify right side
    20,756.90x = 387,509,108.12
  5. Step 5: Solve for x
    x = 387,509,108.12/20,756.90
  6. Step 6: Final answer
    x = 18,668.93

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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.