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Finding the Fourth Proportional to 127,686.60, 191,529.90 and 72,390.60

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Solution

The fourth proportional to 127,686.60, 191,529.90 and 72,390.60 is: 108,585.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,686.60 : 191,529.90 = 72,390.60 : x
  2. Step 2: Convert to fraction form
    127,686.60/191,529.90 = 72,390.60/x
  3. Step 3: Cross multiply
    127,686.60x = 191,529.90 × 72,390.60
  4. Step 4: Simplify right side
    127,686.60x = 13,864,964,378.94
  5. Step 5: Solve for x
    x = 13,864,964,378.94/127,686.60
  6. Step 6: Final answer
    x = 108,585.90

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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.