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Finding the Fourth Proportional to 598.90, 898.79 and 393.40

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Solution

The fourth proportional to 598.90, 898.79 and 393.40 is: 590.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    598.90 : 898.79 = 393.40 : x
  2. Step 2: Convert to fraction form
    598.90/898.79 = 393.40/x
  3. Step 3: Cross multiply
    598.90x = 898.79 × 393.40
  4. Step 4: Simplify right side
    598.90x = 353,577.53
  5. Step 5: Solve for x
    x = 353,577.53/598.90
  6. Step 6: Final answer
    x = 590.38

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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.