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Finding the Fourth Proportional to 885.72, 1,222.41 and 637.86

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Solution

The fourth proportional to 885.72, 1,222.41 and 637.86 is: 880.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.72 : 1,222.41 = 637.86 : x
  2. Step 2: Convert to fraction form
    885.72/1,222.41 = 637.86/x
  3. Step 3: Cross multiply
    885.72x = 1,222.41 × 637.86
  4. Step 4: Simplify right side
    885.72x = 779,726.44
  5. Step 5: Solve for x
    x = 779,726.44/885.72
  6. Step 6: Final answer
    x = 880.33

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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.