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Finding the Fourth Proportional to 434.95, 648.79 and 393.91

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Solution

The fourth proportional to 434.95, 648.79 and 393.91 is: 587.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.95 : 648.79 = 393.91 : x
  2. Step 2: Convert to fraction form
    434.95/648.79 = 393.91/x
  3. Step 3: Cross multiply
    434.95x = 648.79 × 393.91
  4. Step 4: Simplify right side
    434.95x = 255,565.85
  5. Step 5: Solve for x
    x = 255,565.85/434.95
  6. Step 6: Final answer
    x = 587.58

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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.