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Finding the Fourth Proportional to 71,643.90, 98,864.06 and 39,810.90

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Solution

The fourth proportional to 71,643.90, 98,864.06 and 39,810.90 is: 54,936.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,643.90 : 98,864.06 = 39,810.90 : x
  2. Step 2: Convert to fraction form
    71,643.90/98,864.06 = 39,810.90/x
  3. Step 3: Cross multiply
    71,643.90x = 98,864.06 × 39,810.90
  4. Step 4: Simplify right side
    71,643.90x = 3,935,867,206.25
  5. Step 5: Solve for x
    x = 3,935,867,206.25/71,643.90
  6. Step 6: Final answer
    x = 54,936.53

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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.