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Finding the Fourth Proportional to 71,643.06, 98,866.71 and 39,811.28

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Solution

The fourth proportional to 71,643.06, 98,866.71 and 39,811.28 is: 54,939.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,643.06 : 98,866.71 = 39,811.28 : x
  2. Step 2: Convert to fraction form
    71,643.06/98,866.71 = 39,811.28/x
  3. Step 3: Cross multiply
    71,643.06x = 98,866.71 × 39,811.28
  4. Step 4: Simplify right side
    71,643.06x = 3,936,009,780.16
  5. Step 5: Solve for x
    x = 3,936,009,780.16/71,643.06
  6. Step 6: Final answer
    x = 54,939.16

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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.