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Finding the Fourth Proportional to 986.18, 1,360.05 and 636.50

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Solution

The fourth proportional to 986.18, 1,360.05 and 636.50 is: 877.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.18 : 1,360.05 = 636.50 : x
  2. Step 2: Convert to fraction form
    986.18/1,360.05 = 636.50/x
  3. Step 3: Cross multiply
    986.18x = 1,360.05 × 636.50
  4. Step 4: Simplify right side
    986.18x = 865,671.83
  5. Step 5: Solve for x
    x = 865,671.83/986.18
  6. Step 6: Final answer
    x = 877.80

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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.