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Finding the Fourth Proportional to 21,159.70, 29,203.50 and 12,205.45

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Solution

The fourth proportional to 21,159.70, 29,203.50 and 12,205.45 is: 16,845.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,159.70 : 29,203.50 = 12,205.45 : x
  2. Step 2: Convert to fraction form
    21,159.70/29,203.50 = 12,205.45/x
  3. Step 3: Cross multiply
    21,159.70x = 29,203.50 × 12,205.45
  4. Step 4: Simplify right side
    21,159.70x = 356,441,859.08
  5. Step 5: Solve for x
    x = 356,441,859.08/21,159.70
  6. Step 6: Final answer
    x = 16,845.32

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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.