Home / 21,099.78-29,117.70-12,717.90

Finding the Fourth Proportional to 21,099.78, 29,117.70 and 12,717.90

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Solution

The fourth proportional to 21,099.78, 29,117.70 and 12,717.90 is: 17,550.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,099.78 : 29,117.70 = 12,717.90 : x
  2. Step 2: Convert to fraction form
    21,099.78/29,117.70 = 12,717.90/x
  3. Step 3: Cross multiply
    21,099.78x = 29,117.70 × 12,717.90
  4. Step 4: Simplify right side
    21,099.78x = 370,315,996.83
  5. Step 5: Solve for x
    x = 370,315,996.83/21,099.78
  6. Step 6: Final answer
    x = 17,550.70

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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.