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Finding the Fourth Proportional to 608.34, 840 and 398.70

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Solution

The fourth proportional to 608.34, 840 and 398.70 is: 550.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.34 : 840 = 398.70 : x
  2. Step 2: Convert to fraction form
    608.34/840 = 398.70/x
  3. Step 3: Cross multiply
    608.34x = 840 × 398.70
  4. Step 4: Simplify right side
    608.34x = 334,908
  5. Step 5: Solve for x
    x = 334,908/608.34
  6. Step 6: Final answer
    x = 550.53

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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.