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Finding the Fourth Proportional to 1,407.21, 1,941.87 and 909.87

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Solution

The fourth proportional to 1,407.21, 1,941.87 and 909.87 is: 1,255.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.21 : 1,941.87 = 909.87 : x
  2. Step 2: Convert to fraction form
    1,407.21/1,941.87 = 909.87/x
  3. Step 3: Cross multiply
    1,407.21x = 1,941.87 × 909.87
  4. Step 4: Simplify right side
    1,407.21x = 1,766,849.26
  5. Step 5: Solve for x
    x = 1,766,849.26/1,407.21
  6. Step 6: Final answer
    x = 1,255.57

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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.