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Finding the Fourth Proportional to 879.19, 1,213.25 and 486.21

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Solution

The fourth proportional to 879.19, 1,213.25 and 486.21 is: 670.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.19 : 1,213.25 = 486.21 : x
  2. Step 2: Convert to fraction form
    879.19/1,213.25 = 486.21/x
  3. Step 3: Cross multiply
    879.19x = 1,213.25 × 486.21
  4. Step 4: Simplify right side
    879.19x = 589,894.28
  5. Step 5: Solve for x
    x = 589,894.28/879.19
  6. Step 6: Final answer
    x = 670.95

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Half scale
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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.