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Finding the Fourth Proportional to 443.88, 666.54 and 390.24

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Solution

The fourth proportional to 443.88, 666.54 and 390.24 is: 585.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.88 : 666.54 = 390.24 : x
  2. Step 2: Convert to fraction form
    443.88/666.54 = 390.24/x
  3. Step 3: Cross multiply
    443.88x = 666.54 × 390.24
  4. Step 4: Simplify right side
    443.88x = 260,110.57
  5. Step 5: Solve for x
    x = 260,110.57/443.88
  6. Step 6: Final answer
    x = 585.99

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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.