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Finding the Fourth Proportional to 885.66, 1,223.18 and 688.87

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Solution

The fourth proportional to 885.66, 1,223.18 and 688.87 is: 951.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.66 : 1,223.18 = 688.87 : x
  2. Step 2: Convert to fraction form
    885.66/1,223.18 = 688.87/x
  3. Step 3: Cross multiply
    885.66x = 1,223.18 × 688.87
  4. Step 4: Simplify right side
    885.66x = 842,612.01
  5. Step 5: Solve for x
    x = 842,612.01/885.66
  6. Step 6: Final answer
    x = 951.39

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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.