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Finding the Fourth Proportional to 71,172, 98,216.64 and 39,339.36

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Solution

The fourth proportional to 71,172, 98,216.64 and 39,339.36 is: 54,287.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,172 : 98,216.64 = 39,339.36 : x
  2. Step 2: Convert to fraction form
    71,172/98,216.64 = 39,339.36/x
  3. Step 3: Cross multiply
    71,172x = 98,216.64 × 39,339.36
  4. Step 4: Simplify right side
    71,172x = 3,863,779,758.95
  5. Step 5: Solve for x
    x = 3,863,779,758.95/71,172
  6. Step 6: Final answer
    x = 54,287.92

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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.