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Finding the Fourth Proportional to 879.13, 1,213.23 and 486.19

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Solution

The fourth proportional to 879.13, 1,213.23 and 486.19 is: 670.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.13 : 1,213.23 = 486.19 : x
  2. Step 2: Convert to fraction form
    879.13/1,213.23 = 486.19/x
  3. Step 3: Cross multiply
    879.13x = 1,213.23 × 486.19
  4. Step 4: Simplify right side
    879.13x = 589,860.29
  5. Step 5: Solve for x
    x = 589,860.29/879.13
  6. Step 6: Final answer
    x = 670.96

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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.