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Finding the Fourth Proportional to 443,780.46, 665,704.71 and 128,240.10

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Solution

The fourth proportional to 443,780.46, 665,704.71 and 128,240.10 is: 192,369.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,780.46 : 665,704.71 = 128,240.10 : x
  2. Step 2: Convert to fraction form
    443,780.46/665,704.71 = 128,240.10/x
  3. Step 3: Cross multiply
    443,780.46x = 665,704.71 × 128,240.10
  4. Step 4: Simplify right side
    443,780.46x = 85,370,038,580.87
  5. Step 5: Solve for x
    x = 85,370,038,580.87/443,780.46
  6. Step 6: Final answer
    x = 192,369.98

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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.