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Finding the Fourth Proportional to 21,777.60, 30,058.80 and 18,235.20

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Solution

The fourth proportional to 21,777.60, 30,058.80 and 18,235.20 is: 25,169.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,777.60 : 30,058.80 = 18,235.20 : x
  2. Step 2: Convert to fraction form
    21,777.60/30,058.80 = 18,235.20/x
  3. Step 3: Cross multiply
    21,777.60x = 30,058.80 × 18,235.20
  4. Step 4: Simplify right side
    21,777.60x = 548,128,229.76
  5. Step 5: Solve for x
    x = 548,128,229.76/21,777.60
  6. Step 6: Final answer
    x = 25,169.36

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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.