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Finding the Fourth Proportional to 883.59, 1,217.07 and 621.15

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Solution

The fourth proportional to 883.59, 1,217.07 and 621.15 is: 855.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.59 : 1,217.07 = 621.15 : x
  2. Step 2: Convert to fraction form
    883.59/1,217.07 = 621.15/x
  3. Step 3: Cross multiply
    883.59x = 1,217.07 × 621.15
  4. Step 4: Simplify right side
    883.59x = 755,983.03
  5. Step 5: Solve for x
    x = 755,983.03/883.59
  6. Step 6: Final answer
    x = 855.58

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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.