Home / 21,122.16-29,149.50-11,690.72

Finding the Fourth Proportional to 21,122.16, 29,149.50 and 11,690.72

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Solution

The fourth proportional to 21,122.16, 29,149.50 and 11,690.72 is: 16,133.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,122.16 : 29,149.50 = 11,690.72 : x
  2. Step 2: Convert to fraction form
    21,122.16/29,149.50 = 11,690.72/x
  3. Step 3: Cross multiply
    21,122.16x = 29,149.50 × 11,690.72
  4. Step 4: Simplify right side
    21,122.16x = 340,778,642.64
  5. Step 5: Solve for x
    x = 340,778,642.64/21,122.16
  6. Step 6: Final answer
    x = 16,133.70

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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.