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Finding the Fourth Proportional to 307.60, 421.71 and 302.13

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Solution

The fourth proportional to 307.60, 421.71 and 302.13 is: 414.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.60 : 421.71 = 302.13 : x
  2. Step 2: Convert to fraction form
    307.60/421.71 = 302.13/x
  3. Step 3: Cross multiply
    307.60x = 421.71 × 302.13
  4. Step 4: Simplify right side
    307.60x = 127,410.11
  5. Step 5: Solve for x
    x = 127,410.11/307.60
  6. Step 6: Final answer
    x = 414.21

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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.