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Finding the Fourth Proportional to 558.58, 838.50 and 396.40

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Solution

The fourth proportional to 558.58, 838.50 and 396.40 is: 595.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.58 : 838.50 = 396.40 : x
  2. Step 2: Convert to fraction form
    558.58/838.50 = 396.40/x
  3. Step 3: Cross multiply
    558.58x = 838.50 × 396.40
  4. Step 4: Simplify right side
    558.58x = 332,381.40
  5. Step 5: Solve for x
    x = 332,381.40/558.58
  6. Step 6: Final answer
    x = 595.05

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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.