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Finding the Fourth Proportional to 607.07, 908.78 and 390.19

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Solution

The fourth proportional to 607.07, 908.78 and 390.19 is: 584.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.07 : 908.78 = 390.19 : x
  2. Step 2: Convert to fraction form
    607.07/908.78 = 390.19/x
  3. Step 3: Cross multiply
    607.07x = 908.78 × 390.19
  4. Step 4: Simplify right side
    607.07x = 354,596.87
  5. Step 5: Solve for x
    x = 354,596.87/607.07
  6. Step 6: Final answer
    x = 584.11

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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.