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Finding the Fourth Proportional to 624.45, 861.26 and 403.46

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Solution

The fourth proportional to 624.45, 861.26 and 403.46 is: 556.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.45 : 861.26 = 403.46 : x
  2. Step 2: Convert to fraction form
    624.45/861.26 = 403.46/x
  3. Step 3: Cross multiply
    624.45x = 861.26 × 403.46
  4. Step 4: Simplify right side
    624.45x = 347,477.64
  5. Step 5: Solve for x
    x = 347,477.64/624.45
  6. Step 6: Final answer
    x = 556.45

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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.