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Finding the Fourth Proportional to 1,478.61, 2,039.90 and 889.07

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Solution

The fourth proportional to 1,478.61, 2,039.90 and 889.07 is: 1,226.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.61 : 2,039.90 = 889.07 : x
  2. Step 2: Convert to fraction form
    1,478.61/2,039.90 = 889.07/x
  3. Step 3: Cross multiply
    1,478.61x = 2,039.90 × 889.07
  4. Step 4: Simplify right side
    1,478.61x = 1,813,599.25
  5. Step 5: Solve for x
    x = 1,813,599.25/1,478.61
  6. Step 6: Final answer
    x = 1,226.56

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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.