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Finding the Fourth Proportional to 313.16, 469.66 and 215.64

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Solution

The fourth proportional to 313.16, 469.66 and 215.64 is: 323.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.16 : 469.66 = 215.64 : x
  2. Step 2: Convert to fraction form
    313.16/469.66 = 215.64/x
  3. Step 3: Cross multiply
    313.16x = 469.66 × 215.64
  4. Step 4: Simplify right side
    313.16x = 101,277.48
  5. Step 5: Solve for x
    x = 101,277.48/313.16
  6. Step 6: Final answer
    x = 323.40

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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.