Home / 21,079.45-31,615.11-9,831.68

Finding the Fourth Proportional to 21,079.45, 31,615.11 and 9,831.68

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Solution

The fourth proportional to 21,079.45, 31,615.11 and 9,831.68 is: 14,745.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,079.45 : 31,615.11 = 9,831.68 : x
  2. Step 2: Convert to fraction form
    21,079.45/31,615.11 = 9,831.68/x
  3. Step 3: Cross multiply
    21,079.45x = 31,615.11 × 9,831.68
  4. Step 4: Simplify right side
    21,079.45x = 310,829,644.68
  5. Step 5: Solve for x
    x = 310,829,644.68/21,079.45
  6. Step 6: Final answer
    x = 14,745.63

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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.