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Finding the Fourth Proportional to 778.22, 1,167.54 and 647.52

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Solution

The fourth proportional to 778.22, 1,167.54 and 647.52 is: 971.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.22 : 1,167.54 = 647.52 : x
  2. Step 2: Convert to fraction form
    778.22/1,167.54 = 647.52/x
  3. Step 3: Cross multiply
    778.22x = 1,167.54 × 647.52
  4. Step 4: Simplify right side
    778.22x = 756,005.50
  5. Step 5: Solve for x
    x = 756,005.50/778.22
  6. Step 6: Final answer
    x = 971.45

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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.