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Finding the Fourth Proportional to 21,893.57, 30,335.16 and 21,420.63

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Solution

The fourth proportional to 21,893.57, 30,335.16 and 21,420.63 is: 29,679.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,893.57 : 30,335.16 = 21,420.63 : x
  2. Step 2: Convert to fraction form
    21,893.57/30,335.16 = 21,420.63/x
  3. Step 3: Cross multiply
    21,893.57x = 30,335.16 × 21,420.63
  4. Step 4: Simplify right side
    21,893.57x = 649,798,238.35
  5. Step 5: Solve for x
    x = 649,798,238.35/21,893.57
  6. Step 6: Final answer
    x = 29,679.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.