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Finding the Fourth Proportional to 1,245.87, 1,719.74 and 774.14

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Solution

The fourth proportional to 1,245.87, 1,719.74 and 774.14 is: 1,068.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.87 : 1,719.74 = 774.14 : x
  2. Step 2: Convert to fraction form
    1,245.87/1,719.74 = 774.14/x
  3. Step 3: Cross multiply
    1,245.87x = 1,719.74 × 774.14
  4. Step 4: Simplify right side
    1,245.87x = 1,331,307.05
  5. Step 5: Solve for x
    x = 1,331,307.05/1,245.87
  6. Step 6: Final answer
    x = 1,068.58

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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.