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Finding the Fourth Proportional to 836.79, 1,255.19 and 259.66

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Solution

The fourth proportional to 836.79, 1,255.19 and 259.66 is: 389.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.79 : 1,255.19 = 259.66 : x
  2. Step 2: Convert to fraction form
    836.79/1,255.19 = 259.66/x
  3. Step 3: Cross multiply
    836.79x = 1,255.19 × 259.66
  4. Step 4: Simplify right side
    836.79x = 325,922.64
  5. Step 5: Solve for x
    x = 325,922.64/836.79
  6. Step 6: Final answer
    x = 389.49

Related Problems

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Half scale
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Double scale
Find fourth proportional to 837.79, 1,256.69 and 260.66
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.