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Finding the Fourth Proportional to 443,715.36, 665,475.12 and 128,103.60

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Solution

The fourth proportional to 443,715.36, 665,475.12 and 128,103.60 is: 192,127.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,715.36 : 665,475.12 = 128,103.60 : x
  2. Step 2: Convert to fraction form
    443,715.36/665,475.12 = 128,103.60/x
  3. Step 3: Cross multiply
    443,715.36x = 665,475.12 × 128,103.60
  4. Step 4: Simplify right side
    443,715.36x = 85,249,758,582.43
  5. Step 5: Solve for x
    x = 85,249,758,582.43/443,715.36
  6. Step 6: Final answer
    x = 192,127.13

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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.