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Finding the Fourth Proportional to 128,431.50, 177,235.50 and 71,842.86

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Solution

The fourth proportional to 128,431.50, 177,235.50 and 71,842.86 is: 99,143.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,431.50 : 177,235.50 = 71,842.86 : x
  2. Step 2: Convert to fraction form
    128,431.50/177,235.50 = 71,842.86/x
  3. Step 3: Cross multiply
    128,431.50x = 177,235.50 × 71,842.86
  4. Step 4: Simplify right side
    128,431.50x = 12,733,105,213.53
  5. Step 5: Solve for x
    x = 12,733,105,213.53/128,431.50
  6. Step 6: Final answer
    x = 99,143.16

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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.