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Finding the Fourth Proportional to 885.88, 1,221.42 and 688.96

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Solution

The fourth proportional to 885.88, 1,221.42 and 688.96 is: 949.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.88 : 1,221.42 = 688.96 : x
  2. Step 2: Convert to fraction form
    885.88/1,221.42 = 688.96/x
  3. Step 3: Cross multiply
    885.88x = 1,221.42 × 688.96
  4. Step 4: Simplify right side
    885.88x = 841,509.52
  5. Step 5: Solve for x
    x = 841,509.52/885.88
  6. Step 6: Final answer
    x = 949.91

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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.