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Finding the Fourth Proportional to 529.09, 729.51 and 455.28

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Solution

The fourth proportional to 529.09, 729.51 and 455.28 is: 627.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.09 : 729.51 = 455.28 : x
  2. Step 2: Convert to fraction form
    529.09/729.51 = 455.28/x
  3. Step 3: Cross multiply
    529.09x = 729.51 × 455.28
  4. Step 4: Simplify right side
    529.09x = 332,134.88
  5. Step 5: Solve for x
    x = 332,134.88/529.09
  6. Step 6: Final answer
    x = 627.74

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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.