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Finding the Fourth Proportional to 128,959.06, 177,980.22 and 72,370.44

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Solution

The fourth proportional to 128,959.06, 177,980.22 and 72,370.44 is: 99,880.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,959.06 : 177,980.22 = 72,370.44 : x
  2. Step 2: Convert to fraction form
    128,959.06/177,980.22 = 72,370.44/x
  3. Step 3: Cross multiply
    128,959.06x = 177,980.22 × 72,370.44
  4. Step 4: Simplify right side
    128,959.06x = 12,880,506,832.70
  5. Step 5: Solve for x
    x = 12,880,506,832.70/128,959.06
  6. Step 6: Final answer
    x = 99,880.59

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1.5x scale

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.