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Finding the Fourth Proportional to 879.66, 1,213.92 and 525.56

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Solution

The fourth proportional to 879.66, 1,213.92 and 525.56 is: 725.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.66 : 1,213.92 = 525.56 : x
  2. Step 2: Convert to fraction form
    879.66/1,213.92 = 525.56/x
  3. Step 3: Cross multiply
    879.66x = 1,213.92 × 525.56
  4. Step 4: Simplify right side
    879.66x = 637,981.73
  5. Step 5: Solve for x
    x = 637,981.73/879.66
  6. Step 6: Final answer
    x = 725.26

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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.