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Finding the Fourth Proportional to 879.86, 1,214.12 and 486.84

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Solution

The fourth proportional to 879.86, 1,214.12 and 486.84 is: 671.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.86 : 1,214.12 = 486.84 : x
  2. Step 2: Convert to fraction form
    879.86/1,214.12 = 486.84/x
  3. Step 3: Cross multiply
    879.86x = 1,214.12 × 486.84
  4. Step 4: Simplify right side
    879.86x = 591,087.95
  5. Step 5: Solve for x
    x = 591,087.95/879.86
  6. Step 6: Final answer
    x = 671.80

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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.