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Finding the Fourth Proportional to 307.69, 424.80 and 214.40

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Solution

The fourth proportional to 307.69, 424.80 and 214.40 is: 296.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.69 : 424.80 = 214.40 : x
  2. Step 2: Convert to fraction form
    307.69/424.80 = 214.40/x
  3. Step 3: Cross multiply
    307.69x = 424.80 × 214.40
  4. Step 4: Simplify right side
    307.69x = 91,078.18
  5. Step 5: Solve for x
    x = 91,078.18/307.69
  6. Step 6: Final answer
    x = 296.01

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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.