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Finding the Fourth Proportional to 555.09, 831.71 and 391.98

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Solution

The fourth proportional to 555.09, 831.71 and 391.98 is: 587.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.09 : 831.71 = 391.98 : x
  2. Step 2: Convert to fraction form
    555.09/831.71 = 391.98/x
  3. Step 3: Cross multiply
    555.09x = 831.71 × 391.98
  4. Step 4: Simplify right side
    555.09x = 326,011.73
  5. Step 5: Solve for x
    x = 326,011.73/555.09
  6. Step 6: Final answer
    x = 587.31

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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.