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Finding the Fourth Proportional to 1,406.62, 1,939.74 and 909.52

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Solution

The fourth proportional to 1,406.62, 1,939.74 and 909.52 is: 1,254.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.62 : 1,939.74 = 909.52 : x
  2. Step 2: Convert to fraction form
    1,406.62/1,939.74 = 909.52/x
  3. Step 3: Cross multiply
    1,406.62x = 1,939.74 × 909.52
  4. Step 4: Simplify right side
    1,406.62x = 1,764,232.32
  5. Step 5: Solve for x
    x = 1,764,232.32/1,406.62
  6. Step 6: Final answer
    x = 1,254.24

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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.