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Finding the Fourth Proportional to 642.71, 962.35 and 437.67

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Solution

The fourth proportional to 642.71, 962.35 and 437.67 is: 655.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.71 : 962.35 = 437.67 : x
  2. Step 2: Convert to fraction form
    642.71/962.35 = 437.67/x
  3. Step 3: Cross multiply
    642.71x = 962.35 × 437.67
  4. Step 4: Simplify right side
    642.71x = 421,194.24
  5. Step 5: Solve for x
    x = 421,194.24/642.71
  6. Step 6: Final answer
    x = 655.35

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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.