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Finding the Fourth Proportional to 555.77, 766.72 and 319.66

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Solution

The fourth proportional to 555.77, 766.72 and 319.66 is: 440.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.77 : 766.72 = 319.66 : x
  2. Step 2: Convert to fraction form
    555.77/766.72 = 319.66/x
  3. Step 3: Cross multiply
    555.77x = 766.72 × 319.66
  4. Step 4: Simplify right side
    555.77x = 245,091.07
  5. Step 5: Solve for x
    x = 245,091.07/555.77
  6. Step 6: Final answer
    x = 440.99

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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.