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Finding the Fourth Proportional to 885.03, 1,220.24 and 648.78

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Solution

The fourth proportional to 885.03, 1,220.24 and 648.78 is: 894.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.03 : 1,220.24 = 648.78 : x
  2. Step 2: Convert to fraction form
    885.03/1,220.24 = 648.78/x
  3. Step 3: Cross multiply
    885.03x = 1,220.24 × 648.78
  4. Step 4: Simplify right side
    885.03x = 791,664.06
  5. Step 5: Solve for x
    x = 791,664.06/885.03
  6. Step 6: Final answer
    x = 894.51

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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.