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Finding the Fourth Proportional to 1,392.80, 2,089.22 and 468.45

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Solution

The fourth proportional to 1,392.80, 2,089.22 and 468.45 is: 702.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.80 : 2,089.22 = 468.45 : x
  2. Step 2: Convert to fraction form
    1,392.80/2,089.22 = 468.45/x
  3. Step 3: Cross multiply
    1,392.80x = 2,089.22 × 468.45
  4. Step 4: Simplify right side
    1,392.80x = 978,692.77
  5. Step 5: Solve for x
    x = 978,692.77/1,392.80
  6. Step 6: Final answer
    x = 702.68

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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.