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Finding the Fourth Proportional to 451.72, 623.72 and 304.70

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Solution

The fourth proportional to 451.72, 623.72 and 304.70 is: 420.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.72 : 623.72 = 304.70 : x
  2. Step 2: Convert to fraction form
    451.72/623.72 = 304.70/x
  3. Step 3: Cross multiply
    451.72x = 623.72 × 304.70
  4. Step 4: Simplify right side
    451.72x = 190,045.96
  5. Step 5: Solve for x
    x = 190,045.96/451.72
  6. Step 6: Final answer
    x = 420.72

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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.