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Finding the Fourth Proportional to 879.15, 1,213.18 and 486.19

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Solution

The fourth proportional to 879.15, 1,213.18 and 486.19 is: 670.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.15 : 1,213.18 = 486.19 : x
  2. Step 2: Convert to fraction form
    879.15/1,213.18 = 486.19/x
  3. Step 3: Cross multiply
    879.15x = 1,213.18 × 486.19
  4. Step 4: Simplify right side
    879.15x = 589,829.46
  5. Step 5: Solve for x
    x = 589,829.46/879.15
  6. Step 6: Final answer
    x = 670.91

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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.