Home / 21,006.40-28,981.20-12,511.12

Finding the Fourth Proportional to 21,006.40, 28,981.20 and 12,511.12

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Solution

The fourth proportional to 21,006.40, 28,981.20 and 12,511.12 is: 17,260.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.40 : 28,981.20 = 12,511.12 : x
  2. Step 2: Convert to fraction form
    21,006.40/28,981.20 = 12,511.12/x
  3. Step 3: Cross multiply
    21,006.40x = 28,981.20 × 12,511.12
  4. Step 4: Simplify right side
    21,006.40x = 362,587,270.94
  5. Step 5: Solve for x
    x = 362,587,270.94/21,006.40
  6. Step 6: Final answer
    x = 17,260.80

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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.