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Finding the Fourth Proportional to 505.08, 756.90 and 288.21

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Solution

The fourth proportional to 505.08, 756.90 and 288.21 is: 431.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.08 : 756.90 = 288.21 : x
  2. Step 2: Convert to fraction form
    505.08/756.90 = 288.21/x
  3. Step 3: Cross multiply
    505.08x = 756.90 × 288.21
  4. Step 4: Simplify right side
    505.08x = 218,146.15
  5. Step 5: Solve for x
    x = 218,146.15/505.08
  6. Step 6: Final answer
    x = 431.90

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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.