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Finding the Fourth Proportional to 162,078.30, 243,336.15 and 128,835.90

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Solution

The fourth proportional to 162,078.30, 243,336.15 and 128,835.90 is: 193,427.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    162,078.30 : 243,336.15 = 128,835.90 : x
  2. Step 2: Convert to fraction form
    162,078.30/243,336.15 = 128,835.90/x
  3. Step 3: Cross multiply
    162,078.30x = 243,336.15 × 128,835.90
  4. Step 4: Simplify right side
    162,078.30x = 31,350,431,887.79
  5. Step 5: Solve for x
    x = 31,350,431,887.79/162,078.30
  6. Step 6: Final answer
    x = 193,427.69

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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.