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Finding the Fourth Proportional to 443.04, 661.40 and 439.98

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Solution

The fourth proportional to 443.04, 661.40 and 439.98 is: 656.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.04 : 661.40 = 439.98 : x
  2. Step 2: Convert to fraction form
    443.04/661.40 = 439.98/x
  3. Step 3: Cross multiply
    443.04x = 661.40 × 439.98
  4. Step 4: Simplify right side
    443.04x = 291,000.57
  5. Step 5: Solve for x
    x = 291,000.57/443.04
  6. Step 6: Final answer
    x = 656.83

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.