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Finding the Fourth Proportional to 216,978.76, 325,520.10 and 90,548.68

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Solution

The fourth proportional to 216,978.76, 325,520.10 and 90,548.68 is: 135,844.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,978.76 : 325,520.10 = 90,548.68 : x
  2. Step 2: Convert to fraction form
    216,978.76/325,520.10 = 90,548.68/x
  3. Step 3: Cross multiply
    216,978.76x = 325,520.10 × 90,548.68
  4. Step 4: Simplify right side
    216,978.76x = 29,475,413,288.12
  5. Step 5: Solve for x
    x = 29,475,413,288.12/216,978.76
  6. Step 6: Final answer
    x = 135,844.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.