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Finding the Fourth Proportional to 1,611.50, 2,223.75 and 912.86

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Solution

The fourth proportional to 1,611.50, 2,223.75 and 912.86 is: 1,259.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611.50 : 2,223.75 = 912.86 : x
  2. Step 2: Convert to fraction form
    1,611.50/2,223.75 = 912.86/x
  3. Step 3: Cross multiply
    1,611.50x = 2,223.75 × 912.86
  4. Step 4: Simplify right side
    1,611.50x = 2,029,972.43
  5. Step 5: Solve for x
    x = 2,029,972.43/1,611.50
  6. Step 6: Final answer
    x = 1,259.68

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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.