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Finding the Fourth Proportional to 558.81, 840.15 and 451.35

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Solution

The fourth proportional to 558.81, 840.15 and 451.35 is: 678.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.81 : 840.15 = 451.35 : x
  2. Step 2: Convert to fraction form
    558.81/840.15 = 451.35/x
  3. Step 3: Cross multiply
    558.81x = 840.15 × 451.35
  4. Step 4: Simplify right side
    558.81x = 379,201.70
  5. Step 5: Solve for x
    x = 379,201.70/558.81
  6. Step 6: Final answer
    x = 678.59

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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.