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Finding the Fourth Proportional to 1,216.25, 1,678.46 and 664.25

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Solution

The fourth proportional to 1,216.25, 1,678.46 and 664.25 is: 916.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.25 : 1,678.46 = 664.25 : x
  2. Step 2: Convert to fraction form
    1,216.25/1,678.46 = 664.25/x
  3. Step 3: Cross multiply
    1,216.25x = 1,678.46 × 664.25
  4. Step 4: Simplify right side
    1,216.25x = 1,114,913.73
  5. Step 5: Solve for x
    x = 1,114,913.73/1,216.25
  6. Step 6: Final answer
    x = 916.68

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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.