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Finding the Fourth Proportional to 307.90, 424.76 and 189.77

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Solution

The fourth proportional to 307.90, 424.76 and 189.77 is: 261.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.90 : 424.76 = 189.77 : x
  2. Step 2: Convert to fraction form
    307.90/424.76 = 189.77/x
  3. Step 3: Cross multiply
    307.90x = 424.76 × 189.77
  4. Step 4: Simplify right side
    307.90x = 80,606.82
  5. Step 5: Solve for x
    x = 80,606.82/307.90
  6. Step 6: Final answer
    x = 261.80

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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.