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Finding the Fourth Proportional to 443,406.80, 665,207.40 and 143,836.40

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Solution

The fourth proportional to 443,406.80, 665,207.40 and 143,836.40 is: 215,786.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,406.80 : 665,207.40 = 143,836.40 : x
  2. Step 2: Convert to fraction form
    443,406.80/665,207.40 = 143,836.40/x
  3. Step 3: Cross multiply
    443,406.80x = 665,207.40 × 143,836.40
  4. Step 4: Simplify right side
    443,406.80x = 95,681,037,669.36
  5. Step 5: Solve for x
    x = 95,681,037,669.36/443,406.80
  6. Step 6: Final answer
    x = 215,786.13

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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.