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Finding the Fourth Proportional to 487.69, 673.11 and 313.13

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Solution

The fourth proportional to 487.69, 673.11 and 313.13 is: 432.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.69 : 673.11 = 313.13 : x
  2. Step 2: Convert to fraction form
    487.69/673.11 = 313.13/x
  3. Step 3: Cross multiply
    487.69x = 673.11 × 313.13
  4. Step 4: Simplify right side
    487.69x = 210,772.62
  5. Step 5: Solve for x
    x = 210,772.62/487.69
  6. Step 6: Final answer
    x = 432.19

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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.