Home / 21,128.88-31,680.36-9,426

Finding the Fourth Proportional to 21,128.88, 31,680.36 and 9,426

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Solution

The fourth proportional to 21,128.88, 31,680.36 and 9,426 is: 14,133.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,128.88 : 31,680.36 = 9,426 : x
  2. Step 2: Convert to fraction form
    21,128.88/31,680.36 = 9,426/x
  3. Step 3: Cross multiply
    21,128.88x = 31,680.36 × 9,426
  4. Step 4: Simplify right side
    21,128.88x = 298,619,073.36
  5. Step 5: Solve for x
    x = 298,619,073.36/21,128.88
  6. Step 6: Final answer
    x = 14,133.22

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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.