Home / 21,120.16-29,145.42-11,688.76

Finding the Fourth Proportional to 21,120.16, 29,145.42 and 11,688.76

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Solution

The fourth proportional to 21,120.16, 29,145.42 and 11,688.76 is: 16,130.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.16 : 29,145.42 = 11,688.76 : x
  2. Step 2: Convert to fraction form
    21,120.16/29,145.42 = 11,688.76/x
  3. Step 3: Cross multiply
    21,120.16x = 29,145.42 × 11,688.76
  4. Step 4: Simplify right side
    21,120.16x = 340,673,819.48
  5. Step 5: Solve for x
    x = 340,673,819.48/21,120.16
  6. Step 6: Final answer
    x = 16,130.27

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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.