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Finding the Fourth Proportional to 647.96, 971.85 and 185.78

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Solution

The fourth proportional to 647.96, 971.85 and 185.78 is: 278.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.96 : 971.85 = 185.78 : x
  2. Step 2: Convert to fraction form
    647.96/971.85 = 185.78/x
  3. Step 3: Cross multiply
    647.96x = 971.85 × 185.78
  4. Step 4: Simplify right side
    647.96x = 180,550.29
  5. Step 5: Solve for x
    x = 180,550.29/647.96
  6. Step 6: Final answer
    x = 278.64

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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.