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Finding the Fourth Proportional to 128,990.35, 178,000.69 and 71,633.30

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Solution

The fourth proportional to 128,990.35, 178,000.69 and 71,633.30 is: 98,850.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,990.35 : 178,000.69 = 71,633.30 : x
  2. Step 2: Convert to fraction form
    128,990.35/178,000.69 = 71,633.30/x
  3. Step 3: Cross multiply
    128,990.35x = 178,000.69 × 71,633.30
  4. Step 4: Simplify right side
    128,990.35x = 12,750,776,826.98
  5. Step 5: Solve for x
    x = 12,750,776,826.98/128,990.35
  6. Step 6: Final answer
    x = 98,850.63

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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.