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Finding the Fourth Proportional to 1,219.01, 1,681.11 and 914.97

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Solution

The fourth proportional to 1,219.01, 1,681.11 and 914.97 is: 1,261.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.01 : 1,681.11 = 914.97 : x
  2. Step 2: Convert to fraction form
    1,219.01/1,681.11 = 914.97/x
  3. Step 3: Cross multiply
    1,219.01x = 1,681.11 × 914.97
  4. Step 4: Simplify right side
    1,219.01x = 1,538,165.22
  5. Step 5: Solve for x
    x = 1,538,165.22/1,219.01
  6. Step 6: Final answer
    x = 1,261.81

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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.