Home / 21,117.75-29,139.95-12,168.18

Finding the Fourth Proportional to 21,117.75, 29,139.95 and 12,168.18

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Solution

The fourth proportional to 21,117.75, 29,139.95 and 12,168.18 is: 16,790.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,117.75 : 29,139.95 = 12,168.18 : x
  2. Step 2: Convert to fraction form
    21,117.75/29,139.95 = 12,168.18/x
  3. Step 3: Cross multiply
    21,117.75x = 29,139.95 × 12,168.18
  4. Step 4: Simplify right side
    21,117.75x = 354,580,095.95
  5. Step 5: Solve for x
    x = 354,580,095.95/21,117.75
  6. Step 6: Final answer
    x = 16,790.62

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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.