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Finding the Fourth Proportional to 879.72, 1,214.01 and 486.78

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Solution

The fourth proportional to 879.72, 1,214.01 and 486.78 is: 671.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.72 : 1,214.01 = 486.78 : x
  2. Step 2: Convert to fraction form
    879.72/1,214.01 = 486.78/x
  3. Step 3: Cross multiply
    879.72x = 1,214.01 × 486.78
  4. Step 4: Simplify right side
    879.72x = 590,955.79
  5. Step 5: Solve for x
    x = 590,955.79/879.72
  6. Step 6: Final answer
    x = 671.75

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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.