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Finding the Fourth Proportional to 986.04, 1,357.56 and 811.08

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Solution

The fourth proportional to 986.04, 1,357.56 and 811.08 is: 1,116.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.04 : 1,357.56 = 811.08 : x
  2. Step 2: Convert to fraction form
    986.04/1,357.56 = 811.08/x
  3. Step 3: Cross multiply
    986.04x = 1,357.56 × 811.08
  4. Step 4: Simplify right side
    986.04x = 1,101,089.76
  5. Step 5: Solve for x
    x = 1,101,089.76/986.04
  6. Step 6: Final answer
    x = 1,116.68

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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.