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Finding the Fourth Proportional to 647.72, 971.12 and 300.86

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Solution

The fourth proportional to 647.72, 971.12 and 300.86 is: 451.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.72 : 971.12 = 300.86 : x
  2. Step 2: Convert to fraction form
    647.72/971.12 = 300.86/x
  3. Step 3: Cross multiply
    647.72x = 971.12 × 300.86
  4. Step 4: Simplify right side
    647.72x = 292,171.16
  5. Step 5: Solve for x
    x = 292,171.16/647.72
  6. Step 6: Final answer
    x = 451.08

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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.