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Finding the Fourth Proportional to 1,116.51, 1,540.74 and 619.14

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Solution

The fourth proportional to 1,116.51, 1,540.74 and 619.14 is: 854.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.51 : 1,540.74 = 619.14 : x
  2. Step 2: Convert to fraction form
    1,116.51/1,540.74 = 619.14/x
  3. Step 3: Cross multiply
    1,116.51x = 1,540.74 × 619.14
  4. Step 4: Simplify right side
    1,116.51x = 953,933.76
  5. Step 5: Solve for x
    x = 953,933.76/1,116.51
  6. Step 6: Final answer
    x = 854.39

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Half scale
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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.