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Finding the Fourth Proportional to 61,779.62, 85,264.99 and 39,120.68

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Solution

The fourth proportional to 61,779.62, 85,264.99 and 39,120.68 is: 53,992.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,779.62 : 85,264.99 = 39,120.68 : x
  2. Step 2: Convert to fraction form
    61,779.62/85,264.99 = 39,120.68/x
  3. Step 3: Cross multiply
    61,779.62x = 85,264.99 × 39,120.68
  4. Step 4: Simplify right side
    61,779.62x = 3,335,624,504.35
  5. Step 5: Solve for x
    x = 3,335,624,504.35/61,779.62
  6. Step 6: Final answer
    x = 53,992.31

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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.