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Finding the Fourth Proportional to 879.35, 1,213.52 and 486.40

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Solution

The fourth proportional to 879.35, 1,213.52 and 486.40 is: 671.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.35 : 1,213.52 = 486.40 : x
  2. Step 2: Convert to fraction form
    879.35/1,213.52 = 486.40/x
  3. Step 3: Cross multiply
    879.35x = 1,213.52 × 486.40
  4. Step 4: Simplify right side
    879.35x = 590,247.63
  5. Step 5: Solve for x
    x = 590,247.63/879.35
  6. Step 6: Final answer
    x = 671.24

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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.