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Finding the Fourth Proportional to 553.61, 831.63 and 279.63

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Solution

The fourth proportional to 553.61, 831.63 and 279.63 is: 420.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.61 : 831.63 = 279.63 : x
  2. Step 2: Convert to fraction form
    553.61/831.63 = 279.63/x
  3. Step 3: Cross multiply
    553.61x = 831.63 × 279.63
  4. Step 4: Simplify right side
    553.61x = 232,548.70
  5. Step 5: Solve for x
    x = 232,548.70/553.61
  6. Step 6: Final answer
    x = 420.06

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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.