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Finding the Fourth Proportional to 883.08, 1,218.69 and 621.18

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Solution

The fourth proportional to 883.08, 1,218.69 and 621.18 is: 857.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.08 : 1,218.69 = 621.18 : x
  2. Step 2: Convert to fraction form
    883.08/1,218.69 = 621.18/x
  3. Step 3: Cross multiply
    883.08x = 1,218.69 × 621.18
  4. Step 4: Simplify right side
    883.08x = 757,025.85
  5. Step 5: Solve for x
    x = 757,025.85/883.08
  6. Step 6: Final answer
    x = 857.26

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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.