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Finding the Fourth Proportional to 909.82, 1,365 and 260.56

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Solution

The fourth proportional to 909.82, 1,365 and 260.56 is: 390.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.82 : 1,365 = 260.56 : x
  2. Step 2: Convert to fraction form
    909.82/1,365 = 260.56/x
  3. Step 3: Cross multiply
    909.82x = 1,365 × 260.56
  4. Step 4: Simplify right side
    909.82x = 355,664.40
  5. Step 5: Solve for x
    x = 355,664.40/909.82
  6. Step 6: Final answer
    x = 390.92

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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.