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Finding the Fourth Proportional to 909.61, 1,360.73 and 755.84

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Solution

The fourth proportional to 909.61, 1,360.73 and 755.84 is: 1,130.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.61 : 1,360.73 = 755.84 : x
  2. Step 2: Convert to fraction form
    909.61/1,360.73 = 755.84/x
  3. Step 3: Cross multiply
    909.61x = 1,360.73 × 755.84
  4. Step 4: Simplify right side
    909.61x = 1,028,499.45
  5. Step 5: Solve for x
    x = 1,028,499.45/909.61
  6. Step 6: Final answer
    x = 1,130.71

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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.