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Finding the Fourth Proportional to 555.10, 831.39 and 445.03

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Solution

The fourth proportional to 555.10, 831.39 and 445.03 is: 666.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.10 : 831.39 = 445.03 : x
  2. Step 2: Convert to fraction form
    555.10/831.39 = 445.03/x
  3. Step 3: Cross multiply
    555.10x = 831.39 × 445.03
  4. Step 4: Simplify right side
    555.10x = 369,993.49
  5. Step 5: Solve for x
    x = 369,993.49/555.10
  6. Step 6: Final answer
    x = 666.53

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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.