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Finding the Fourth Proportional to 654.39, 979.70 and 509.67

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Solution

The fourth proportional to 654.39, 979.70 and 509.67 is: 763.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.39 : 979.70 = 509.67 : x
  2. Step 2: Convert to fraction form
    654.39/979.70 = 509.67/x
  3. Step 3: Cross multiply
    654.39x = 979.70 × 509.67
  4. Step 4: Simplify right side
    654.39x = 499,321.15
  5. Step 5: Solve for x
    x = 499,321.15/654.39
  6. Step 6: Final answer
    x = 763.03

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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.