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Finding the Fourth Proportional to 21,642.88, 29,864.64 and 12,210.88

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Solution

The fourth proportional to 21,642.88, 29,864.64 and 12,210.88 is: 16,849.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,642.88 : 29,864.64 = 12,210.88 : x
  2. Step 2: Convert to fraction form
    21,642.88/29,864.64 = 12,210.88/x
  3. Step 3: Cross multiply
    21,642.88x = 29,864.64 × 12,210.88
  4. Step 4: Simplify right side
    21,642.88x = 364,673,535.28
  5. Step 5: Solve for x
    x = 364,673,535.28/21,642.88
  6. Step 6: Final answer
    x = 16,849.58

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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.