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Finding the Fourth Proportional to 500.69, 690.99 and 279.65

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Solution

The fourth proportional to 500.69, 690.99 and 279.65 is: 385.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.69 : 690.99 = 279.65 : x
  2. Step 2: Convert to fraction form
    500.69/690.99 = 279.65/x
  3. Step 3: Cross multiply
    500.69x = 690.99 × 279.65
  4. Step 4: Simplify right side
    500.69x = 193,235.35
  5. Step 5: Solve for x
    x = 193,235.35/500.69
  6. Step 6: Final answer
    x = 385.94

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.