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Finding the Fourth Proportional to 1,138.49, 1,707.73 and 651.20

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Solution

The fourth proportional to 1,138.49, 1,707.73 and 651.20 is: 976.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.49 : 1,707.73 = 651.20 : x
  2. Step 2: Convert to fraction form
    1,138.49/1,707.73 = 651.20/x
  3. Step 3: Cross multiply
    1,138.49x = 1,707.73 × 651.20
  4. Step 4: Simplify right side
    1,138.49x = 1,112,065.44
  5. Step 5: Solve for x
    x = 1,112,065.44/1,138.49
  6. Step 6: Final answer
    x = 976.79

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.