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Finding the Fourth Proportional to 21,706.28, 29,839.79 and 18,670.30

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Solution

The fourth proportional to 21,706.28, 29,839.79 and 18,670.30 is: 25,666.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,706.28 : 29,839.79 = 18,670.30 : x
  2. Step 2: Convert to fraction form
    21,706.28/29,839.79 = 18,670.30/x
  3. Step 3: Cross multiply
    21,706.28x = 29,839.79 × 18,670.30
  4. Step 4: Simplify right side
    21,706.28x = 557,117,803.31
  5. Step 5: Solve for x
    x = 557,117,803.31/21,706.28
  6. Step 6: Final answer
    x = 25,666.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.