Home / 21,011.12-28,993.27-12,511.55

Finding the Fourth Proportional to 21,011.12, 28,993.27 and 12,511.55

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Solution

The fourth proportional to 21,011.12, 28,993.27 and 12,511.55 is: 17,264.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.12 : 28,993.27 = 12,511.55 : x
  2. Step 2: Convert to fraction form
    21,011.12/28,993.27 = 12,511.55/x
  3. Step 3: Cross multiply
    21,011.12x = 28,993.27 × 12,511.55
  4. Step 4: Simplify right side
    21,011.12x = 362,750,747.27
  5. Step 5: Solve for x
    x = 362,750,747.27/21,011.12
  6. Step 6: Final answer
    x = 17,264.70

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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.