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Finding the Fourth Proportional to 555.51, 766.71 and 319.50

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Solution

The fourth proportional to 555.51, 766.71 and 319.50 is: 440.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.51 : 766.71 = 319.50 : x
  2. Step 2: Convert to fraction form
    555.51/766.71 = 319.50/x
  3. Step 3: Cross multiply
    555.51x = 766.71 × 319.50
  4. Step 4: Simplify right side
    555.51x = 244,963.85
  5. Step 5: Solve for x
    x = 244,963.85/555.51
  6. Step 6: Final answer
    x = 440.97

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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.