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Finding the Fourth Proportional to 319.20, 440.46 and 236.76

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Solution

The fourth proportional to 319.20, 440.46 and 236.76 is: 326.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.20 : 440.46 = 236.76 : x
  2. Step 2: Convert to fraction form
    319.20/440.46 = 236.76/x
  3. Step 3: Cross multiply
    319.20x = 440.46 × 236.76
  4. Step 4: Simplify right side
    319.20x = 104,283.31
  5. Step 5: Solve for x
    x = 104,283.31/319.20
  6. Step 6: Final answer
    x = 326.70

Related Problems

Find fourth proportional to 159.60, 220.23 and 118.38
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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.