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Finding the Fourth Proportional to 215,978.60, 323,852.70 and 91,178.60

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Solution

The fourth proportional to 215,978.60, 323,852.70 and 91,178.60 is: 136,719.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,978.60 : 323,852.70 = 91,178.60 : x
  2. Step 2: Convert to fraction form
    215,978.60/323,852.70 = 91,178.60/x
  3. Step 3: Cross multiply
    215,978.60x = 323,852.70 × 91,178.60
  4. Step 4: Simplify right side
    215,978.60x = 29,528,435,792.22
  5. Step 5: Solve for x
    x = 29,528,435,792.22/215,978.60
  6. Step 6: Final answer
    x = 136,719.27

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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.