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Finding the Fourth Proportional to 61,608.78, 85,038.30 and 36,120.68

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Solution

The fourth proportional to 61,608.78, 85,038.30 and 36,120.68 is: 49,857.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,608.78 : 85,038.30 = 36,120.68 : x
  2. Step 2: Convert to fraction form
    61,608.78/85,038.30 = 36,120.68/x
  3. Step 3: Cross multiply
    61,608.78x = 85,038.30 × 36,120.68
  4. Step 4: Simplify right side
    61,608.78x = 3,071,641,434.64
  5. Step 5: Solve for x
    x = 3,071,641,434.64/61,608.78
  6. Step 6: Final answer
    x = 49,857.20

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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.