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Finding the Fourth Proportional to 840.67, 1,260.97 and 255.67

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Solution

The fourth proportional to 840.67, 1,260.97 and 255.67 is: 383.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.67 : 1,260.97 = 255.67 : x
  2. Step 2: Convert to fraction form
    840.67/1,260.97 = 255.67/x
  3. Step 3: Cross multiply
    840.67x = 1,260.97 × 255.67
  4. Step 4: Simplify right side
    840.67x = 322,392.20
  5. Step 5: Solve for x
    x = 322,392.20/840.67
  6. Step 6: Final answer
    x = 383.49

Related Problems

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Half scale
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Double scale
Find fourth proportional to 841.67, 1,262.47 and 256.67
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.