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Finding the Fourth Proportional to 21,657.78, 29,887.95 and 12,705.44

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Solution

The fourth proportional to 21,657.78, 29,887.95 and 12,705.44 is: 17,533.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,657.78 : 29,887.95 = 12,705.44 : x
  2. Step 2: Convert to fraction form
    21,657.78/29,887.95 = 12,705.44/x
  3. Step 3: Cross multiply
    21,657.78x = 29,887.95 × 12,705.44
  4. Step 4: Simplify right side
    21,657.78x = 379,739,406.01
  5. Step 5: Solve for x
    x = 379,739,406.01/21,657.78
  6. Step 6: Final answer
    x = 17,533.63

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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.