Home / 20,721.17-31,044.59-12,591.93

Finding the Fourth Proportional to 20,721.17, 31,044.59 and 12,591.93

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Solution

The fourth proportional to 20,721.17, 31,044.59 and 12,591.93 is: 18,865.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.17 : 31,044.59 = 12,591.93 : x
  2. Step 2: Convert to fraction form
    20,721.17/31,044.59 = 12,591.93/x
  3. Step 3: Cross multiply
    20,721.17x = 31,044.59 × 12,591.93
  4. Step 4: Simplify right side
    20,721.17x = 390,911,352.94
  5. Step 5: Solve for x
    x = 390,911,352.94/20,721.17
  6. Step 6: Final answer
    x = 18,865.32

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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.