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Finding the Fourth Proportional to 442.10, 662.98 and 210.81

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Solution

The fourth proportional to 442.10, 662.98 and 210.81 is: 316.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.10 : 662.98 = 210.81 : x
  2. Step 2: Convert to fraction form
    442.10/662.98 = 210.81/x
  3. Step 3: Cross multiply
    442.10x = 662.98 × 210.81
  4. Step 4: Simplify right side
    442.10x = 139,762.81
  5. Step 5: Solve for x
    x = 139,762.81/442.10
  6. Step 6: Final answer
    x = 316.13

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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.