Home / 21,107.76-29,135.67-12,157.47

Finding the Fourth Proportional to 21,107.76, 29,135.67 and 12,157.47

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Solution

The fourth proportional to 21,107.76, 29,135.67 and 12,157.47 is: 16,781.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,107.76 : 29,135.67 = 12,157.47 : x
  2. Step 2: Convert to fraction form
    21,107.76/29,135.67 = 12,157.47/x
  3. Step 3: Cross multiply
    21,107.76x = 29,135.67 × 12,157.47
  4. Step 4: Simplify right side
    21,107.76x = 354,216,033.95
  5. Step 5: Solve for x
    x = 354,216,033.95/21,107.76
  6. Step 6: Final answer
    x = 16,781.32

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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.