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Finding the Fourth Proportional to 425, 637.50 and 121

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Solution

The fourth proportional to 425, 637.50 and 121 is: 181.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    425 : 637.50 = 121 : x
  2. Step 2: Convert to fraction form
    425/637.50 = 121/x
  3. Step 3: Cross multiply
    425x = 637.50 × 121
  4. Step 4: Simplify right side
    425x = 77,137.50
  5. Step 5: Solve for x
    x = 77,137.50/425
  6. Step 6: Final answer
    x = 181.50

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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.