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Finding the Fourth Proportional to 313.39, 470.07 and 121

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Solution

The fourth proportional to 313.39, 470.07 and 121 is: 181.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.39 : 470.07 = 121 : x
  2. Step 2: Convert to fraction form
    313.39/470.07 = 121/x
  3. Step 3: Cross multiply
    313.39x = 470.07 × 121
  4. Step 4: Simplify right side
    313.39x = 56,878.47
  5. Step 5: Solve for x
    x = 56,878.47/313.39
  6. Step 6: Final answer
    x = 181.49

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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.