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Finding the Fourth Proportional to 986.32, 1,362.18 and 861.40

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Solution

The fourth proportional to 986.32, 1,362.18 and 861.40 is: 1,189.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.32 : 1,362.18 = 861.40 : x
  2. Step 2: Convert to fraction form
    986.32/1,362.18 = 861.40/x
  3. Step 3: Cross multiply
    986.32x = 1,362.18 × 861.40
  4. Step 4: Simplify right side
    986.32x = 1,173,381.85
  5. Step 5: Solve for x
    x = 1,173,381.85/986.32
  6. Step 6: Final answer
    x = 1,189.66

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1.5x scale

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.