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Finding the Fourth Proportional to 307.40, 424.12 and 277.80

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Solution

The fourth proportional to 307.40, 424.12 and 277.80 is: 383.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.40 : 424.12 = 277.80 : x
  2. Step 2: Convert to fraction form
    307.40/424.12 = 277.80/x
  3. Step 3: Cross multiply
    307.40x = 424.12 × 277.80
  4. Step 4: Simplify right side
    307.40x = 117,822.29
  5. Step 5: Solve for x
    x = 117,822.29/307.40
  6. Step 6: Final answer
    x = 383.28

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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.