Home / 21,215-29,284.08-12,831.56

Finding the Fourth Proportional to 21,215, 29,284.08 and 12,831.56

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Solution

The fourth proportional to 21,215, 29,284.08 and 12,831.56 is: 17,712.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,215 : 29,284.08 = 12,831.56 : x
  2. Step 2: Convert to fraction form
    21,215/29,284.08 = 12,831.56/x
  3. Step 3: Cross multiply
    21,215x = 29,284.08 × 12,831.56
  4. Step 4: Simplify right side
    21,215x = 375,760,429.56
  5. Step 5: Solve for x
    x = 375,760,429.56/21,215
  6. Step 6: Final answer
    x = 17,712.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.