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Finding the Fourth Proportional to 986.11, 1,479.40 and 678.11

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Solution

The fourth proportional to 986.11, 1,479.40 and 678.11 is: 1,017.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.11 : 1,479.40 = 678.11 : x
  2. Step 2: Convert to fraction form
    986.11/1,479.40 = 678.11/x
  3. Step 3: Cross multiply
    986.11x = 1,479.40 × 678.11
  4. Step 4: Simplify right side
    986.11x = 1,003,186.84
  5. Step 5: Solve for x
    x = 1,003,186.84/986.11
  6. Step 6: Final answer
    x = 1,017.32

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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.