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Finding the Fourth Proportional to 986.76, 1,480.66 and 656.89

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Solution

The fourth proportional to 986.76, 1,480.66 and 656.89 is: 985.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.76 : 1,480.66 = 656.89 : x
  2. Step 2: Convert to fraction form
    986.76/1,480.66 = 656.89/x
  3. Step 3: Cross multiply
    986.76x = 1,480.66 × 656.89
  4. Step 4: Simplify right side
    986.76x = 972,625.40
  5. Step 5: Solve for x
    x = 972,625.40/986.76
  6. Step 6: Final answer
    x = 985.68

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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.