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Finding the Fourth Proportional to 1,431.44, 2,143.59 and 909.86

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Solution

The fourth proportional to 1,431.44, 2,143.59 and 909.86 is: 1,362.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.44 : 2,143.59 = 909.86 : x
  2. Step 2: Convert to fraction form
    1,431.44/2,143.59 = 909.86/x
  3. Step 3: Cross multiply
    1,431.44x = 2,143.59 × 909.86
  4. Step 4: Simplify right side
    1,431.44x = 1,950,366.80
  5. Step 5: Solve for x
    x = 1,950,366.80/1,431.44
  6. Step 6: Final answer
    x = 1,362.52

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1.5x scale

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.