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Finding the Fourth Proportional to 127,972.80, 191,959.20 and 112,420.80

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Solution

The fourth proportional to 127,972.80, 191,959.20 and 112,420.80 is: 168,631.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,972.80 : 191,959.20 = 112,420.80 : x
  2. Step 2: Convert to fraction form
    127,972.80/191,959.20 = 112,420.80/x
  3. Step 3: Cross multiply
    127,972.80x = 191,959.20 × 112,420.80
  4. Step 4: Simplify right side
    127,972.80x = 21,580,206,831.36
  5. Step 5: Solve for x
    x = 21,580,206,831.36/127,972.80
  6. Step 6: Final answer
    x = 168,631.20

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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.