Home / 20,983.76-28,957.70-12,031.80

Finding the Fourth Proportional to 20,983.76, 28,957.70 and 12,031.80

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Solution

The fourth proportional to 20,983.76, 28,957.70 and 12,031.80 is: 16,603.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,983.76 : 28,957.70 = 12,031.80 : x
  2. Step 2: Convert to fraction form
    20,983.76/28,957.70 = 12,031.80/x
  3. Step 3: Cross multiply
    20,983.76x = 28,957.70 × 12,031.80
  4. Step 4: Simplify right side
    20,983.76x = 348,413,254.86
  5. Step 5: Solve for x
    x = 348,413,254.86/20,983.76
  6. Step 6: Final answer
    x = 16,603.95

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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.