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Finding the Fourth Proportional to 312.22, 430.91 and 302.66

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Solution

The fourth proportional to 312.22, 430.91 and 302.66 is: 417.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.22 : 430.91 = 302.66 : x
  2. Step 2: Convert to fraction form
    312.22/430.91 = 302.66/x
  3. Step 3: Cross multiply
    312.22x = 430.91 × 302.66
  4. Step 4: Simplify right side
    312.22x = 130,419.22
  5. Step 5: Solve for x
    x = 130,419.22/312.22
  6. Step 6: Final answer
    x = 417.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.