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Finding the Fourth Proportional to 127,920.80, 191,881.20 and 120,663.20

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Solution

The fourth proportional to 127,920.80, 191,881.20 and 120,663.20 is: 180,994.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,920.80 : 191,881.20 = 120,663.20 : x
  2. Step 2: Convert to fraction form
    127,920.80/191,881.20 = 120,663.20/x
  3. Step 3: Cross multiply
    127,920.80x = 191,881.20 × 120,663.20
  4. Step 4: Simplify right side
    127,920.80x = 23,152,999,611.84
  5. Step 5: Solve for x
    x = 23,152,999,611.84/127,920.80
  6. Step 6: Final answer
    x = 180,994.80

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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.