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Finding the Fourth Proportional to 1,317.99, 1,976.99 and 1,237.80

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Solution

The fourth proportional to 1,317.99, 1,976.99 and 1,237.80 is: 1,856.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.99 : 1,976.99 = 1,237.80 : x
  2. Step 2: Convert to fraction form
    1,317.99/1,976.99 = 1,237.80/x
  3. Step 3: Cross multiply
    1,317.99x = 1,976.99 × 1,237.80
  4. Step 4: Simplify right side
    1,317.99x = 2,447,118.22
  5. Step 5: Solve for x
    x = 2,447,118.22/1,317.99
  6. Step 6: Final answer
    x = 1,856.70

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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.