Home / 21,121.36-29,148.18-12,168.16

Finding the Fourth Proportional to 21,121.36, 29,148.18 and 12,168.16

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Solution

The fourth proportional to 21,121.36, 29,148.18 and 12,168.16 is: 16,792.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.36 : 29,148.18 = 12,168.16 : x
  2. Step 2: Convert to fraction form
    21,121.36/29,148.18 = 12,168.16/x
  3. Step 3: Cross multiply
    21,121.36x = 29,148.18 × 12,168.16
  4. Step 4: Simplify right side
    21,121.36x = 354,679,717.95
  5. Step 5: Solve for x
    x = 354,679,717.95/21,121.36
  6. Step 6: Final answer
    x = 16,792.47

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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.