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Finding the Fourth Proportional to 555.29, 831.64 and 438.95

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Solution

The fourth proportional to 555.29, 831.64 and 438.95 is: 657.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.29 : 831.64 = 438.95 : x
  2. Step 2: Convert to fraction form
    555.29/831.64 = 438.95/x
  3. Step 3: Cross multiply
    555.29x = 831.64 × 438.95
  4. Step 4: Simplify right side
    555.29x = 365,049.36
  5. Step 5: Solve for x
    x = 365,049.36/555.29
  6. Step 6: Final answer
    x = 657.40

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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.