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Finding the Fourth Proportional to 840.99, 1,256.80 and 794.19

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Solution

The fourth proportional to 840.99, 1,256.80 and 794.19 is: 1,186.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.99 : 1,256.80 = 794.19 : x
  2. Step 2: Convert to fraction form
    840.99/1,256.80 = 794.19/x
  3. Step 3: Cross multiply
    840.99x = 1,256.80 × 794.19
  4. Step 4: Simplify right side
    840.99x = 998,136.01
  5. Step 5: Solve for x
    x = 998,136.01/840.99
  6. Step 6: Final answer
    x = 1,186.86

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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 (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.