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Finding the Fourth Proportional to 923.86, 1,386.33 and 491.32

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Solution

The fourth proportional to 923.86, 1,386.33 and 491.32 is: 737.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.86 : 1,386.33 = 491.32 : x
  2. Step 2: Convert to fraction form
    923.86/1,386.33 = 491.32/x
  3. Step 3: Cross multiply
    923.86x = 1,386.33 × 491.32
  4. Step 4: Simplify right side
    923.86x = 681,131.66
  5. Step 5: Solve for x
    x = 681,131.66/923.86
  6. Step 6: Final answer
    x = 737.27

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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.