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Finding the Fourth Proportional to 313.64, 470.18 and 121.13

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Solution

The fourth proportional to 313.64, 470.18 and 121.13 is: 181.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.64 : 470.18 = 121.13 : x
  2. Step 2: Convert to fraction form
    313.64/470.18 = 121.13/x
  3. Step 3: Cross multiply
    313.64x = 470.18 × 121.13
  4. Step 4: Simplify right side
    313.64x = 56,950.86
  5. Step 5: Solve for x
    x = 56,950.86/313.64
  6. Step 6: Final answer
    x = 181.58

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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.