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Finding the Fourth Proportional to 664.14, 915.65 and 427.67

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Solution

The fourth proportional to 664.14, 915.65 and 427.67 is: 589.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.14 : 915.65 = 427.67 : x
  2. Step 2: Convert to fraction form
    664.14/915.65 = 427.67/x
  3. Step 3: Cross multiply
    664.14x = 915.65 × 427.67
  4. Step 4: Simplify right side
    664.14x = 391,591.46
  5. Step 5: Solve for x
    x = 391,591.46/664.14
  6. Step 6: Final answer
    x = 589.62

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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.