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Finding the Fourth Proportional to 1,128.34, 1,692.78 and 397.99

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Solution

The fourth proportional to 1,128.34, 1,692.78 and 397.99 is: 597.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.34 : 1,692.78 = 397.99 : x
  2. Step 2: Convert to fraction form
    1,128.34/1,692.78 = 397.99/x
  3. Step 3: Cross multiply
    1,128.34x = 1,692.78 × 397.99
  4. Step 4: Simplify right side
    1,128.34x = 673,699.06
  5. Step 5: Solve for x
    x = 673,699.06/1,128.34
  6. Step 6: Final answer
    x = 597.07

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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.