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Finding the Fourth Proportional to 127,980.60, 191,970.90 and 72,684.60

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Solution

The fourth proportional to 127,980.60, 191,970.90 and 72,684.60 is: 109,026.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,980.60 : 191,970.90 = 72,684.60 : x
  2. Step 2: Convert to fraction form
    127,980.60/191,970.90 = 72,684.60/x
  3. Step 3: Cross multiply
    127,980.60x = 191,970.90 × 72,684.60
  4. Step 4: Simplify right side
    127,980.60x = 13,953,328,078.14
  5. Step 5: Solve for x
    x = 13,953,328,078.14/127,980.60
  6. Step 6: Final answer
    x = 109,026.90

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1.5x scale

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.