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Finding the Fourth Proportional to 21,642.56, 29,866.80 and 11,706.56

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Solution

The fourth proportional to 21,642.56, 29,866.80 and 11,706.56 is: 16,155.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,642.56 : 29,866.80 = 11,706.56 : x
  2. Step 2: Convert to fraction form
    21,642.56/29,866.80 = 11,706.56/x
  3. Step 3: Cross multiply
    21,642.56x = 29,866.80 × 11,706.56
  4. Step 4: Simplify right side
    21,642.56x = 349,637,486.21
  5. Step 5: Solve for x
    x = 349,637,486.21/21,642.56
  6. Step 6: Final answer
    x = 16,155.09

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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.