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Finding the Fourth Proportional to 1,665.71, 2,298.66 and 919.64

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Solution

The fourth proportional to 1,665.71, 2,298.66 and 919.64 is: 1,269.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,665.71 : 2,298.66 = 919.64 : x
  2. Step 2: Convert to fraction form
    1,665.71/2,298.66 = 919.64/x
  3. Step 3: Cross multiply
    1,665.71x = 2,298.66 × 919.64
  4. Step 4: Simplify right side
    1,665.71x = 2,113,939.68
  5. Step 5: Solve for x
    x = 2,113,939.68/1,665.71
  6. Step 6: Final answer
    x = 1,269.09

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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.