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Finding the Fourth Proportional to 522.64, 722.28 and 391.60

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Solution

The fourth proportional to 522.64, 722.28 and 391.60 is: 541.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.64 : 722.28 = 391.60 : x
  2. Step 2: Convert to fraction form
    522.64/722.28 = 391.60/x
  3. Step 3: Cross multiply
    522.64x = 722.28 × 391.60
  4. Step 4: Simplify right side
    522.64x = 282,844.85
  5. Step 5: Solve for x
    x = 282,844.85/522.64
  6. Step 6: Final answer
    x = 541.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.