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Finding the Fourth Proportional to 986.91, 1,362.33 and 655.23

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Solution

The fourth proportional to 986.91, 1,362.33 and 655.23 is: 904.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.91 : 1,362.33 = 655.23 : x
  2. Step 2: Convert to fraction form
    986.91/1,362.33 = 655.23/x
  3. Step 3: Cross multiply
    986.91x = 1,362.33 × 655.23
  4. Step 4: Simplify right side
    986.91x = 892,639.49
  5. Step 5: Solve for x
    x = 892,639.49/986.91
  6. Step 6: Final answer
    x = 904.48

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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.