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Finding the Fourth Proportional to 443,717.86, 665,478.87 and 128,106.10

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Solution

The fourth proportional to 443,717.86, 665,478.87 and 128,106.10 is: 192,130.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,717.86 : 665,478.87 = 128,106.10 : x
  2. Step 2: Convert to fraction form
    443,717.86/665,478.87 = 128,106.10/x
  3. Step 3: Cross multiply
    443,717.86x = 665,478.87 × 128,106.10
  4. Step 4: Simplify right side
    443,717.86x = 85,251,902,668.11
  5. Step 5: Solve for x
    x = 85,251,902,668.11/443,717.86
  6. Step 6: Final answer
    x = 192,130.88

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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.