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Finding the Fourth Proportional to 155,676.38, 214,820.64 and 87,671.61

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Solution

The fourth proportional to 155,676.38, 214,820.64 and 87,671.61 is: 120,979.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,676.38 : 214,820.64 = 87,671.61 : x
  2. Step 2: Convert to fraction form
    155,676.38/214,820.64 = 87,671.61/x
  3. Step 3: Cross multiply
    155,676.38x = 214,820.64 × 87,671.61
  4. Step 4: Simplify right side
    155,676.38x = 18,833,671,370.03
  5. Step 5: Solve for x
    x = 18,833,671,370.03/155,676.38
  6. Step 6: Final answer
    x = 120,979.64

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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.