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Finding the Fourth Proportional to 61,539.90, 92,309.88 and 19,986.90

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Solution

The fourth proportional to 61,539.90, 92,309.88 and 19,986.90 is: 29,980.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,539.90 : 92,309.88 = 19,986.90 : x
  2. Step 2: Convert to fraction form
    61,539.90/92,309.88 = 19,986.90/x
  3. Step 3: Cross multiply
    61,539.90x = 92,309.88 × 19,986.90
  4. Step 4: Simplify right side
    61,539.90x = 1,844,988,340.57
  5. Step 5: Solve for x
    x = 1,844,988,340.57/61,539.90
  6. Step 6: Final answer
    x = 29,980.36

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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.