Home / 21,118.64-29,143.36-11,687.20

Finding the Fourth Proportional to 21,118.64, 29,143.36 and 11,687.20

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Solution

The fourth proportional to 21,118.64, 29,143.36 and 11,687.20 is: 16,128.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118.64 : 29,143.36 = 11,687.20 : x
  2. Step 2: Convert to fraction form
    21,118.64/29,143.36 = 11,687.20/x
  3. Step 3: Cross multiply
    21,118.64x = 29,143.36 × 11,687.20
  4. Step 4: Simplify right side
    21,118.64x = 340,604,276.99
  5. Step 5: Solve for x
    x = 340,604,276.99/21,118.64
  6. Step 6: Final answer
    x = 16,128.14

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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.