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Finding the Fourth Proportional to 608.48, 912 and 391.68

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Solution

The fourth proportional to 608.48, 912 and 391.68 is: 587.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.48 : 912 = 391.68 : x
  2. Step 2: Convert to fraction form
    608.48/912 = 391.68/x
  3. Step 3: Cross multiply
    608.48x = 912 × 391.68
  4. Step 4: Simplify right side
    608.48x = 357,212.16
  5. Step 5: Solve for x
    x = 357,212.16/608.48
  6. Step 6: Final answer
    x = 587.06

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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.