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Finding the Fourth Proportional to 439.59, 657.77 and 390.45

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Solution

The fourth proportional to 439.59, 657.77 and 390.45 is: 584.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.59 : 657.77 = 390.45 : x
  2. Step 2: Convert to fraction form
    439.59/657.77 = 390.45/x
  3. Step 3: Cross multiply
    439.59x = 657.77 × 390.45
  4. Step 4: Simplify right side
    439.59x = 256,824.34
  5. Step 5: Solve for x
    x = 256,824.34/439.59
  6. Step 6: Final answer
    x = 584.24

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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.