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Finding the Fourth Proportional to 1,392.88, 2,089.62 and 623.92

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Solution

The fourth proportional to 1,392.88, 2,089.62 and 623.92 is: 936.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.88 : 2,089.62 = 623.92 : x
  2. Step 2: Convert to fraction form
    1,392.88/2,089.62 = 623.92/x
  3. Step 3: Cross multiply
    1,392.88x = 2,089.62 × 623.92
  4. Step 4: Simplify right side
    1,392.88x = 1,303,755.71
  5. Step 5: Solve for x
    x = 1,303,755.71/1,392.88
  6. Step 6: Final answer
    x = 936.01

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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.