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Finding the Fourth Proportional to 509.30, 764.40 and 436.40

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Solution

The fourth proportional to 509.30, 764.40 and 436.40 is: 654.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.30 : 764.40 = 436.40 : x
  2. Step 2: Convert to fraction form
    509.30/764.40 = 436.40/x
  3. Step 3: Cross multiply
    509.30x = 764.40 × 436.40
  4. Step 4: Simplify right side
    509.30x = 333,584.16
  5. Step 5: Solve for x
    x = 333,584.16/509.30
  6. Step 6: Final answer
    x = 654.99

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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.