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Finding the Fourth Proportional to 879.08, 1,213.16 and 486.08

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Solution

The fourth proportional to 879.08, 1,213.16 and 486.08 is: 670.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.08 : 1,213.16 = 486.08 : x
  2. Step 2: Convert to fraction form
    879.08/1,213.16 = 486.08/x
  3. Step 3: Cross multiply
    879.08x = 1,213.16 × 486.08
  4. Step 4: Simplify right side
    879.08x = 589,692.81
  5. Step 5: Solve for x
    x = 589,692.81/879.08
  6. Step 6: Final answer
    x = 670.81

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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.