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Finding the Fourth Proportional to 443.35, 661.24 and 427.87

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Solution

The fourth proportional to 443.35, 661.24 and 427.87 is: 638.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.35 : 661.24 = 427.87 : x
  2. Step 2: Convert to fraction form
    443.35/661.24 = 427.87/x
  3. Step 3: Cross multiply
    443.35x = 661.24 × 427.87
  4. Step 4: Simplify right side
    443.35x = 282,924.76
  5. Step 5: Solve for x
    x = 282,924.76/443.35
  6. Step 6: Final answer
    x = 638.15

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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.