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Finding the Fourth Proportional to 555.45, 831.71 and 445.25

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Solution

The fourth proportional to 555.45, 831.71 and 445.25 is: 666.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.45 : 831.71 = 445.25 : x
  2. Step 2: Convert to fraction form
    555.45/831.71 = 445.25/x
  3. Step 3: Cross multiply
    555.45x = 831.71 × 445.25
  4. Step 4: Simplify right side
    555.45x = 370,312.49
  5. Step 5: Solve for x
    x = 370,312.49/555.45
  6. Step 6: Final answer
    x = 666.69

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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.