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Finding the Fourth Proportional to 509.16, 765 and 326.64

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Solution

The fourth proportional to 509.16, 765 and 326.64 is: 490.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.16 : 765 = 326.64 : x
  2. Step 2: Convert to fraction form
    509.16/765 = 326.64/x
  3. Step 3: Cross multiply
    509.16x = 765 × 326.64
  4. Step 4: Simplify right side
    509.16x = 249,879.60
  5. Step 5: Solve for x
    x = 249,879.60/509.16
  6. Step 6: Final answer
    x = 490.77

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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.