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Finding the Fourth Proportional to 642.36, 962.58 and 436.22

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Solution

The fourth proportional to 642.36, 962.58 and 436.22 is: 653.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.36 : 962.58 = 436.22 : x
  2. Step 2: Convert to fraction form
    642.36/962.58 = 436.22/x
  3. Step 3: Cross multiply
    642.36x = 962.58 × 436.22
  4. Step 4: Simplify right side
    642.36x = 419,897.08
  5. Step 5: Solve for x
    x = 419,897.08/642.36
  6. Step 6: Final answer
    x = 653.67

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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.