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Finding the Fourth Proportional to 443,855.36, 665,787.90 and 128,315

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Solution

The fourth proportional to 443,855.36, 665,787.90 and 128,315 is: 192,473.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,855.36 : 665,787.90 = 128,315 : x
  2. Step 2: Convert to fraction form
    443,855.36/665,787.90 = 128,315/x
  3. Step 3: Cross multiply
    443,855.36x = 665,787.90 × 128,315
  4. Step 4: Simplify right side
    443,855.36x = 85,430,574,388.50
  5. Step 5: Solve for x
    x = 85,430,574,388.50/443,855.36
  6. Step 6: Final answer
    x = 192,473.90

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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.