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Finding the Fourth Proportional to 443,718.86, 665,480.37 and 128,107.10

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Solution

The fourth proportional to 443,718.86, 665,480.37 and 128,107.10 is: 192,132.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,718.86 : 665,480.37 = 128,107.10 : x
  2. Step 2: Convert to fraction form
    443,718.86/665,480.37 = 128,107.10/x
  3. Step 3: Cross multiply
    443,718.86x = 665,480.37 × 128,107.10
  4. Step 4: Simplify right side
    443,718.86x = 85,252,760,307.63
  5. Step 5: Solve for x
    x = 85,252,760,307.63/443,718.86
  6. Step 6: Final answer
    x = 192,132.38

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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.