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Finding the Fourth Proportional to 986.30, 1,360.85 and 671.00

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Solution

The fourth proportional to 986.30, 1,360.85 and 671.00 is: 925.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.30 : 1,360.85 = 671.00 : x
  2. Step 2: Convert to fraction form
    986.30/1,360.85 = 671.00/x
  3. Step 3: Cross multiply
    986.30x = 1,360.85 × 671.00
  4. Step 4: Simplify right side
    986.30x = 913,120.19
  5. Step 5: Solve for x
    x = 913,120.19/986.30
  6. Step 6: Final answer
    x = 925.81

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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.