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Finding the Fourth Proportional to 885.22, 1,221.72 and 637.36

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Solution

The fourth proportional to 885.22, 1,221.72 and 637.36 is: 879.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.22 : 1,221.72 = 637.36 : x
  2. Step 2: Convert to fraction form
    885.22/1,221.72 = 637.36/x
  3. Step 3: Cross multiply
    885.22x = 1,221.72 × 637.36
  4. Step 4: Simplify right side
    885.22x = 778,669.35
  5. Step 5: Solve for x
    x = 778,669.35/885.22
  6. Step 6: Final answer
    x = 879.64

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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.