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Finding the Fourth Proportional to 1,664.79, 2,297.40 and 918.75

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Solution

The fourth proportional to 1,664.79, 2,297.40 and 918.75 is: 1,267.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,664.79 : 2,297.40 = 918.75 : x
  2. Step 2: Convert to fraction form
    1,664.79/2,297.40 = 918.75/x
  3. Step 3: Cross multiply
    1,664.79x = 2,297.40 × 918.75
  4. Step 4: Simplify right side
    1,664.79x = 2,110,736.25
  5. Step 5: Solve for x
    x = 2,110,736.25/1,664.79
  6. Step 6: Final answer
    x = 1,267.87

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Half 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.