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Finding the Fourth Proportional to 313.16, 469.76 and 120.78

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Solution

The fourth proportional to 313.16, 469.76 and 120.78 is: 181.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.16 : 469.76 = 120.78 : x
  2. Step 2: Convert to fraction form
    313.16/469.76 = 120.78/x
  3. Step 3: Cross multiply
    313.16x = 469.76 × 120.78
  4. Step 4: Simplify right side
    313.16x = 56,737.61
  5. Step 5: Solve for x
    x = 56,737.61/313.16
  6. Step 6: Final answer
    x = 181.18

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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.