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Finding the Fourth Proportional to 885.22, 1,220.92 and 649.06

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Solution

The fourth proportional to 885.22, 1,220.92 and 649.06 is: 895.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.22 : 1,220.92 = 649.06 : x
  2. Step 2: Convert to fraction form
    885.22/1,220.92 = 649.06/x
  3. Step 3: Cross multiply
    885.22x = 1,220.92 × 649.06
  4. Step 4: Simplify right side
    885.22x = 792,445.66
  5. Step 5: Solve for x
    x = 792,445.66/885.22
  6. Step 6: Final answer
    x = 895.20

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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.