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Finding the Fourth Proportional to 307.19, 421.45 and 304.67

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Solution

The fourth proportional to 307.19, 421.45 and 304.67 is: 417.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.19 : 421.45 = 304.67 : x
  2. Step 2: Convert to fraction form
    307.19/421.45 = 304.67/x
  3. Step 3: Cross multiply
    307.19x = 421.45 × 304.67
  4. Step 4: Simplify right side
    307.19x = 128,403.17
  5. Step 5: Solve for x
    x = 128,403.17/307.19
  6. Step 6: Final answer
    x = 417.99

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.