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Finding the Fourth Proportional to 883.40, 1,219.38 and 621.48

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Solution

The fourth proportional to 883.40, 1,219.38 and 621.48 is: 857.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.40 : 1,219.38 = 621.48 : x
  2. Step 2: Convert to fraction form
    883.40/1,219.38 = 621.48/x
  3. Step 3: Cross multiply
    883.40x = 1,219.38 × 621.48
  4. Step 4: Simplify right side
    883.40x = 757,820.28
  5. Step 5: Solve for x
    x = 757,820.28/883.40
  6. Step 6: Final answer
    x = 857.85

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Double scale
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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.