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Finding the Fourth Proportional to 51,871.60, 77,845.80 and 20,729.20

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Solution

The fourth proportional to 51,871.60, 77,845.80 and 20,729.20 is: 31,109.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,871.60 : 77,845.80 = 20,729.20 : x
  2. Step 2: Convert to fraction form
    51,871.60/77,845.80 = 20,729.20/x
  3. Step 3: Cross multiply
    51,871.60x = 77,845.80 × 20,729.20
  4. Step 4: Simplify right side
    51,871.60x = 1,613,681,157.36
  5. Step 5: Solve for x
    x = 1,613,681,157.36/51,871.60
  6. Step 6: Final answer
    x = 31,109.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.