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Finding the Fourth Proportional to 486.96, 672.11 and 321.19

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Solution

The fourth proportional to 486.96, 672.11 and 321.19 is: 443.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.96 : 672.11 = 321.19 : x
  2. Step 2: Convert to fraction form
    486.96/672.11 = 321.19/x
  3. Step 3: Cross multiply
    486.96x = 672.11 × 321.19
  4. Step 4: Simplify right side
    486.96x = 215,875.01
  5. Step 5: Solve for x
    x = 215,875.01/486.96
  6. Step 6: Final answer
    x = 443.31

Related Problems

Find fourth proportional to 243.48, 336.06 and 160.60
Half scale
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Double scale
Find fourth proportional to 487.96, 673.49 and 322.19
Similar ratio
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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.