Home / 20,985.80-31,467.90-7,831.40

Finding the Fourth Proportional to 20,985.80, 31,467.90 and 7,831.40

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Solution

The fourth proportional to 20,985.80, 31,467.90 and 7,831.40 is: 11,743.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.80 : 31,467.90 = 7,831.40 : x
  2. Step 2: Convert to fraction form
    20,985.80/31,467.90 = 7,831.40/x
  3. Step 3: Cross multiply
    20,985.80x = 31,467.90 × 7,831.40
  4. Step 4: Simplify right side
    20,985.80x = 246,437,712.06
  5. Step 5: Solve for x
    x = 246,437,712.06/20,985.80
  6. Step 6: Final answer
    x = 11,743.07

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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.