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Finding the Fourth Proportional to 486.90, 729.16 and 255.98

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Solution

The fourth proportional to 486.90, 729.16 and 255.98 is: 383.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.90 : 729.16 = 255.98 : x
  2. Step 2: Convert to fraction form
    486.90/729.16 = 255.98/x
  3. Step 3: Cross multiply
    486.90x = 729.16 × 255.98
  4. Step 4: Simplify right side
    486.90x = 186,652.20
  5. Step 5: Solve for x
    x = 186,652.20/486.90
  6. Step 6: Final answer
    x = 383.35

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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.