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Finding the Fourth Proportional to 21,641.53, 29,865.69 and 12,695.48

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Solution

The fourth proportional to 21,641.53, 29,865.69 and 12,695.48 is: 17,519.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,641.53 : 29,865.69 = 12,695.48 : x
  2. Step 2: Convert to fraction form
    21,641.53/29,865.69 = 12,695.48/x
  3. Step 3: Cross multiply
    21,641.53x = 29,865.69 × 12,695.48
  4. Step 4: Simplify right side
    21,641.53x = 379,159,270.08
  5. Step 5: Solve for x
    x = 379,159,270.08/21,641.53
  6. Step 6: Final answer
    x = 17,519.98

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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.