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Finding the Fourth Proportional to 63,771.42, 87,980.79 and 39,889.02

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Solution

The fourth proportional to 63,771.42, 87,980.79 and 39,889.02 is: 55,031.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    63,771.42 : 87,980.79 = 39,889.02 : x
  2. Step 2: Convert to fraction form
    63,771.42/87,980.79 = 39,889.02/x
  3. Step 3: Cross multiply
    63,771.42x = 87,980.79 × 39,889.02
  4. Step 4: Simplify right side
    63,771.42x = 3,509,467,491.93
  5. Step 5: Solve for x
    x = 3,509,467,491.93/63,771.42
  6. Step 6: Final answer
    x = 55,031.98

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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.