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Finding the Fourth Proportional to 619.47, 929.23 and 445.65

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Solution

The fourth proportional to 619.47, 929.23 and 445.65 is: 668.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.47 : 929.23 = 445.65 : x
  2. Step 2: Convert to fraction form
    619.47/929.23 = 445.65/x
  3. Step 3: Cross multiply
    619.47x = 929.23 × 445.65
  4. Step 4: Simplify right side
    619.47x = 414,111.35
  5. Step 5: Solve for x
    x = 414,111.35/619.47
  6. Step 6: Final answer
    x = 668.49

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Double scale
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Similar ratio
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1.5x scale

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.