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Finding the Fourth Proportional to 879.37, 1,213.55 and 486.37

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Solution

The fourth proportional to 879.37, 1,213.55 and 486.37 is: 671.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.37 : 1,213.55 = 486.37 : x
  2. Step 2: Convert to fraction form
    879.37/1,213.55 = 486.37/x
  3. Step 3: Cross multiply
    879.37x = 1,213.55 × 486.37
  4. Step 4: Simplify right side
    879.37x = 590,225.81
  5. Step 5: Solve for x
    x = 590,225.81/879.37
  6. Step 6: Final answer
    x = 671.20

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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.