Home / 21,220.26-31,831.02-10,128.12

Finding the Fourth Proportional to 21,220.26, 31,831.02 and 10,128.12

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Solution

The fourth proportional to 21,220.26, 31,831.02 and 10,128.12 is: 15,192.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,220.26 : 31,831.02 = 10,128.12 : x
  2. Step 2: Convert to fraction form
    21,220.26/31,831.02 = 10,128.12/x
  3. Step 3: Cross multiply
    21,220.26x = 31,831.02 × 10,128.12
  4. Step 4: Simplify right side
    21,220.26x = 322,388,390.28
  5. Step 5: Solve for x
    x = 322,388,390.28/21,220.26
  6. Step 6: Final answer
    x = 15,192.48

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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.