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Finding the Fourth Proportional to 1,270.95, 1,905.68 and 393.21

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Solution

The fourth proportional to 1,270.95, 1,905.68 and 393.21 is: 589.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.95 : 1,905.68 = 393.21 : x
  2. Step 2: Convert to fraction form
    1,270.95/1,905.68 = 393.21/x
  3. Step 3: Cross multiply
    1,270.95x = 1,905.68 × 393.21
  4. Step 4: Simplify right side
    1,270.95x = 749,332.43
  5. Step 5: Solve for x
    x = 749,332.43/1,270.95
  6. Step 6: Final answer
    x = 589.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.