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Finding the Fourth Proportional to 1,245.74, 1,718.99 and 686.19

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Solution

The fourth proportional to 1,245.74, 1,718.99 and 686.19 is: 946.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.74 : 1,718.99 = 686.19 : x
  2. Step 2: Convert to fraction form
    1,245.74/1,718.99 = 686.19/x
  3. Step 3: Cross multiply
    1,245.74x = 1,718.99 × 686.19
  4. Step 4: Simplify right side
    1,245.74x = 1,179,550.32
  5. Step 5: Solve for x
    x = 1,179,550.32/1,245.74
  6. Step 6: Final answer
    x = 946.87

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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.