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Finding the Fourth Proportional to 879.46, 1,213.52 and 486.40

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Solution

The fourth proportional to 879.46, 1,213.52 and 486.40 is: 671.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.46 : 1,213.52 = 486.40 : x
  2. Step 2: Convert to fraction form
    879.46/1,213.52 = 486.40/x
  3. Step 3: Cross multiply
    879.46x = 1,213.52 × 486.40
  4. Step 4: Simplify right side
    879.46x = 590,256.13
  5. Step 5: Solve for x
    x = 590,256.13/879.46
  6. Step 6: Final answer
    x = 671.16

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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.