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Finding the Fourth Proportional to 767.22, 1,058.38 and 486.98

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Solution

The fourth proportional to 767.22, 1,058.38 and 486.98 is: 671.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.22 : 1,058.38 = 486.98 : x
  2. Step 2: Convert to fraction form
    767.22/1,058.38 = 486.98/x
  3. Step 3: Cross multiply
    767.22x = 1,058.38 × 486.98
  4. Step 4: Simplify right side
    767.22x = 515,409.89
  5. Step 5: Solve for x
    x = 515,409.89/767.22
  6. Step 6: Final answer
    x = 671.79

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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.