Home / 20,971.13-28,940.15-12,587.63

Finding the Fourth Proportional to 20,971.13, 28,940.15 and 12,587.63

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Solution

The fourth proportional to 20,971.13, 28,940.15 and 12,587.63 is: 17,370.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.13 : 28,940.15 = 12,587.63 : x
  2. Step 2: Convert to fraction form
    20,971.13/28,940.15 = 12,587.63/x
  3. Step 3: Cross multiply
    20,971.13x = 28,940.15 × 12,587.63
  4. Step 4: Simplify right side
    20,971.13x = 364,287,787.11
  5. Step 5: Solve for x
    x = 364,287,787.11/20,971.13
  6. Step 6: Final answer
    x = 17,370.92

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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.