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Finding the Fourth Proportional to 307.78, 423.78 and 270.76

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Solution

The fourth proportional to 307.78, 423.78 and 270.76 is: 372.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.78 : 423.78 = 270.76 : x
  2. Step 2: Convert to fraction form
    307.78/423.78 = 270.76/x
  3. Step 3: Cross multiply
    307.78x = 423.78 × 270.76
  4. Step 4: Simplify right side
    307.78x = 114,742.67
  5. Step 5: Solve for x
    x = 114,742.67/307.78
  6. Step 6: Final answer
    x = 372.81

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Find fourth proportional to 153.89, 211.89 and 135.38
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Double scale
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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.