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Finding the Fourth Proportional to 555.99, 830.60 and 398.56

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Solution

The fourth proportional to 555.99, 830.60 and 398.56 is: 595.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.99 : 830.60 = 398.56 : x
  2. Step 2: Convert to fraction form
    555.99/830.60 = 398.56/x
  3. Step 3: Cross multiply
    555.99x = 830.60 × 398.56
  4. Step 4: Simplify right side
    555.99x = 331,043.94
  5. Step 5: Solve for x
    x = 331,043.94/555.99
  6. Step 6: Final answer
    x = 595.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.