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Finding the Fourth Proportional to 642.55, 964.91 and 609.67

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Solution

The fourth proportional to 642.55, 964.91 and 609.67 is: 915.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.55 : 964.91 = 609.67 : x
  2. Step 2: Convert to fraction form
    642.55/964.91 = 609.67/x
  3. Step 3: Cross multiply
    642.55x = 964.91 × 609.67
  4. Step 4: Simplify right side
    642.55x = 588,276.68
  5. Step 5: Solve for x
    x = 588,276.68/642.55
  6. Step 6: Final answer
    x = 915.53

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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.