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Finding the Fourth Proportional to 127,980.40, 191,970.60 and 81,439.60

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Solution

The fourth proportional to 127,980.40, 191,970.60 and 81,439.60 is: 122,159.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,980.40 : 191,970.60 = 81,439.60 : x
  2. Step 2: Convert to fraction form
    127,980.40/191,970.60 = 81,439.60/x
  3. Step 3: Cross multiply
    127,980.40x = 191,970.60 × 81,439.60
  4. Step 4: Simplify right side
    127,980.40x = 15,634,008,875.76
  5. Step 5: Solve for x
    x = 15,634,008,875.76/127,980.40
  6. Step 6: Final answer
    x = 122,159.40

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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.