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Finding the Fourth Proportional to 986.02, 1,359.20 and 811.06

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Solution

The fourth proportional to 986.02, 1,359.20 and 811.06 is: 1,118.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.02 : 1,359.20 = 811.06 : x
  2. Step 2: Convert to fraction form
    986.02/1,359.20 = 811.06/x
  3. Step 3: Cross multiply
    986.02x = 1,359.20 × 811.06
  4. Step 4: Simplify right side
    986.02x = 1,102,392.75
  5. Step 5: Solve for x
    x = 1,102,392.75/986.02
  6. Step 6: Final answer
    x = 1,118.02

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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.