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Finding the Fourth Proportional to 1,392.36, 2,088.76 and 418.34

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Solution

The fourth proportional to 1,392.36, 2,088.76 and 418.34 is: 627.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.36 : 2,088.76 = 418.34 : x
  2. Step 2: Convert to fraction form
    1,392.36/2,088.76 = 418.34/x
  3. Step 3: Cross multiply
    1,392.36x = 2,088.76 × 418.34
  4. Step 4: Simplify right side
    1,392.36x = 873,811.86
  5. Step 5: Solve for x
    x = 873,811.86/1,392.36
  6. Step 6: Final answer
    x = 627.58

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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.