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Finding the Fourth Proportional to 128,990.48, 193,541.16 and 66,704.72

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Solution

The fourth proportional to 128,990.48, 193,541.16 and 66,704.72 is: 100,085.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,990.48 : 193,541.16 = 66,704.72 : x
  2. Step 2: Convert to fraction form
    128,990.48/193,541.16 = 66,704.72/x
  3. Step 3: Cross multiply
    128,990.48x = 193,541.16 × 66,704.72
  4. Step 4: Simplify right side
    128,990.48x = 12,910,108,886.28
  5. Step 5: Solve for x
    x = 12,910,108,886.28/128,990.48
  6. Step 6: Final answer
    x = 100,085.75

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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.