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Finding the Fourth Proportional to 936.19, 1,403.47 and 571.28

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Solution

The fourth proportional to 936.19, 1,403.47 and 571.28 is: 856.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.19 : 1,403.47 = 571.28 : x
  2. Step 2: Convert to fraction form
    936.19/1,403.47 = 571.28/x
  3. Step 3: Cross multiply
    936.19x = 1,403.47 × 571.28
  4. Step 4: Simplify right side
    936.19x = 801,771.49
  5. Step 5: Solve for x
    x = 801,771.49/936.19
  6. Step 6: Final answer
    x = 856.42

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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.