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Finding the Fourth Proportional to 64,890.88, 97,335.74 and 20,517.66

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Solution

The fourth proportional to 64,890.88, 97,335.74 and 20,517.66 is: 30,776.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,890.88 : 97,335.74 = 20,517.66 : x
  2. Step 2: Convert to fraction form
    64,890.88/97,335.74 = 20,517.66/x
  3. Step 3: Cross multiply
    64,890.88x = 97,335.74 × 20,517.66
  4. Step 4: Simplify right side
    64,890.88x = 1,997,101,670.46
  5. Step 5: Solve for x
    x = 1,997,101,670.46/64,890.88
  6. Step 6: Final answer
    x = 30,776.31

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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.