Home / 21,138.17-31,721.63-11,284.52

Finding the Fourth Proportional to 21,138.17, 31,721.63 and 11,284.52

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Solution

The fourth proportional to 21,138.17, 31,721.63 and 11,284.52 is: 16,934.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.17 : 31,721.63 = 11,284.52 : x
  2. Step 2: Convert to fraction form
    21,138.17/31,721.63 = 11,284.52/x
  3. Step 3: Cross multiply
    21,138.17x = 31,721.63 × 11,284.52
  4. Step 4: Simplify right side
    21,138.17x = 357,963,153.14
  5. Step 5: Solve for x
    x = 357,963,153.14/21,138.17
  6. Step 6: Final answer
    x = 16,934.45

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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.