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Finding the Fourth Proportional to 220,512.16, 304,320.06 and 129,928.50

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Solution

The fourth proportional to 220,512.16, 304,320.06 and 129,928.50 is: 179,309.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,512.16 : 304,320.06 = 129,928.50 : x
  2. Step 2: Convert to fraction form
    220,512.16/304,320.06 = 129,928.50/x
  3. Step 3: Cross multiply
    220,512.16x = 304,320.06 × 129,928.50
  4. Step 4: Simplify right side
    220,512.16x = 39,539,848,915.71
  5. Step 5: Solve for x
    x = 39,539,848,915.71/220,512.16
  6. Step 6: Final answer
    x = 179,309.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.