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Finding the Fourth Proportional to 61,121.78, 84,345.65 and 34,625.78

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Solution

The fourth proportional to 61,121.78, 84,345.65 and 34,625.78 is: 47,782.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,121.78 : 84,345.65 = 34,625.78 : x
  2. Step 2: Convert to fraction form
    61,121.78/84,345.65 = 34,625.78/x
  3. Step 3: Cross multiply
    61,121.78x = 84,345.65 × 34,625.78
  4. Step 4: Simplify right side
    61,121.78x = 2,920,533,920.86
  5. Step 5: Solve for x
    x = 2,920,533,920.86/61,121.78
  6. Step 6: Final answer
    x = 47,782.21

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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.