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Finding the Fourth Proportional to 638.16, 873.30 and 624.72

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Solution

The fourth proportional to 638.16, 873.30 and 624.72 is: 854.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.16 : 873.30 = 624.72 : x
  2. Step 2: Convert to fraction form
    638.16/873.30 = 624.72/x
  3. Step 3: Cross multiply
    638.16x = 873.30 × 624.72
  4. Step 4: Simplify right side
    638.16x = 545,567.98
  5. Step 5: Solve for x
    x = 545,567.98/638.16
  6. Step 6: Final answer
    x = 854.91

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.