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Finding the Fourth Proportional to 122,259.78, 168,746.49 and 71,987.94

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Solution

The fourth proportional to 122,259.78, 168,746.49 and 71,987.94 is: 99,359.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,259.78 : 168,746.49 = 71,987.94 : x
  2. Step 2: Convert to fraction form
    122,259.78/168,746.49 = 71,987.94/x
  3. Step 3: Cross multiply
    122,259.78x = 168,746.49 × 71,987.94
  4. Step 4: Simplify right side
    122,259.78x = 12,147,712,197.33
  5. Step 5: Solve for x
    x = 12,147,712,197.33/122,259.78
  6. Step 6: Final answer
    x = 99,359.84

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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.