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Finding the Fourth Proportional to 885.45, 1,220.85 and 688.62

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Solution

The fourth proportional to 885.45, 1,220.85 and 688.62 is: 949.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.45 : 1,220.85 = 688.62 : x
  2. Step 2: Convert to fraction form
    885.45/1,220.85 = 688.62/x
  3. Step 3: Cross multiply
    885.45x = 1,220.85 × 688.62
  4. Step 4: Simplify right side
    885.45x = 840,701.73
  5. Step 5: Solve for x
    x = 840,701.73/885.45
  6. Step 6: Final answer
    x = 949.46

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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.