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Finding the Fourth Proportional to 556.12, 766.90 and 423.69

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Solution

The fourth proportional to 556.12, 766.90 and 423.69 is: 584.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.12 : 766.90 = 423.69 : x
  2. Step 2: Convert to fraction form
    556.12/766.90 = 423.69/x
  3. Step 3: Cross multiply
    556.12x = 766.90 × 423.69
  4. Step 4: Simplify right side
    556.12x = 324,927.86
  5. Step 5: Solve for x
    x = 324,927.86/556.12
  6. Step 6: Final answer
    x = 584.28

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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.