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Finding the Fourth Proportional to 936.55, 1,398.74 and 880.66

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Solution

The fourth proportional to 936.55, 1,398.74 and 880.66 is: 1,315.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.55 : 1,398.74 = 880.66 : x
  2. Step 2: Convert to fraction form
    936.55/1,398.74 = 880.66/x
  3. Step 3: Cross multiply
    936.55x = 1,398.74 × 880.66
  4. Step 4: Simplify right side
    936.55x = 1,231,814.37
  5. Step 5: Solve for x
    x = 1,231,814.37/936.55
  6. Step 6: Final answer
    x = 1,315.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.