Home / 21,088.18-29,100.88-12,138.56

Finding the Fourth Proportional to 21,088.18, 29,100.88 and 12,138.56

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Solution

The fourth proportional to 21,088.18, 29,100.88 and 12,138.56 is: 16,750.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,088.18 : 29,100.88 = 12,138.56 : x
  2. Step 2: Convert to fraction form
    21,088.18/29,100.88 = 12,138.56/x
  3. Step 3: Cross multiply
    21,088.18x = 29,100.88 × 12,138.56
  4. Step 4: Simplify right side
    21,088.18x = 353,242,777.93
  5. Step 5: Solve for x
    x = 353,242,777.93/21,088.18
  6. Step 6: Final answer
    x = 16,750.75

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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.