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Finding the Fourth Proportional to 1,406.31, 1,941.45 and 909.23

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Solution

The fourth proportional to 1,406.31, 1,941.45 and 909.23 is: 1,255.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.31 : 1,941.45 = 909.23 : x
  2. Step 2: Convert to fraction form
    1,406.31/1,941.45 = 909.23/x
  3. Step 3: Cross multiply
    1,406.31x = 1,941.45 × 909.23
  4. Step 4: Simplify right side
    1,406.31x = 1,765,218.75
  5. Step 5: Solve for x
    x = 1,765,218.75/1,406.31
  6. Step 6: Final answer
    x = 1,255.22

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1.5x scale

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.