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Finding the Fourth Proportional to 21,656.68, 29,876.90 and 12,706.92

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Solution

The fourth proportional to 21,656.68, 29,876.90 and 12,706.92 is: 17,530.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,656.68 : 29,876.90 = 12,706.92 : x
  2. Step 2: Convert to fraction form
    21,656.68/29,876.90 = 12,706.92/x
  3. Step 3: Cross multiply
    21,656.68x = 29,876.90 × 12,706.92
  4. Step 4: Simplify right side
    21,656.68x = 379,643,378.15
  5. Step 5: Solve for x
    x = 379,643,378.15/21,656.68
  6. Step 6: Final answer
    x = 17,530.08

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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.