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Finding the Fourth Proportional to 451.20, 624.06 and 399.45

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Solution

The fourth proportional to 451.20, 624.06 and 399.45 is: 552.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.20 : 624.06 = 399.45 : x
  2. Step 2: Convert to fraction form
    451.20/624.06 = 399.45/x
  3. Step 3: Cross multiply
    451.20x = 624.06 × 399.45
  4. Step 4: Simplify right side
    451.20x = 249,280.77
  5. Step 5: Solve for x
    x = 249,280.77/451.20
  6. Step 6: Final answer
    x = 552.48

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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.