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Finding the Fourth Proportional to 949, 1,423.60 and 255.68

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Solution

The fourth proportional to 949, 1,423.60 and 255.68 is: 383.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    949 : 1,423.60 = 255.68 : x
  2. Step 2: Convert to fraction form
    949/1,423.60 = 255.68/x
  3. Step 3: Cross multiply
    949x = 1,423.60 × 255.68
  4. Step 4: Simplify right side
    949x = 363,986.05
  5. Step 5: Solve for x
    x = 363,986.05/949
  6. Step 6: Final answer
    x = 383.55

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Find fourth proportional to 474.50, 711.80 and 127.84
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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.