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Finding the Fourth Proportional to 608.77, 839.72 and 398.96

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Solution

The fourth proportional to 608.77, 839.72 and 398.96 is: 550.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.77 : 839.72 = 398.96 : x
  2. Step 2: Convert to fraction form
    608.77/839.72 = 398.96/x
  3. Step 3: Cross multiply
    608.77x = 839.72 × 398.96
  4. Step 4: Simplify right side
    608.77x = 335,008.50
  5. Step 5: Solve for x
    x = 335,008.50/608.77
  6. Step 6: Final answer
    x = 550.31

Related Problems

Find fourth proportional to 304.38, 419.86 and 199.48
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.