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Finding the Fourth Proportional to 1,120.73, 1,544.08 and 840.53

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Solution

The fourth proportional to 1,120.73, 1,544.08 and 840.53 is: 1,158.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.73 : 1,544.08 = 840.53 : x
  2. Step 2: Convert to fraction form
    1,120.73/1,544.08 = 840.53/x
  3. Step 3: Cross multiply
    1,120.73x = 1,544.08 × 840.53
  4. Step 4: Simplify right side
    1,120.73x = 1,297,845.56
  5. Step 5: Solve for x
    x = 1,297,845.56/1,120.73
  6. Step 6: Final answer
    x = 1,158.04

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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.