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Finding the Fourth Proportional to 1,128.53, 1,692.19 and 348.20

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Solution

The fourth proportional to 1,128.53, 1,692.19 and 348.20 is: 522.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.53 : 1,692.19 = 348.20 : x
  2. Step 2: Convert to fraction form
    1,128.53/1,692.19 = 348.20/x
  3. Step 3: Cross multiply
    1,128.53x = 1,692.19 × 348.20
  4. Step 4: Simplify right side
    1,128.53x = 589,218.88
  5. Step 5: Solve for x
    x = 589,218.88/1,128.53
  6. Step 6: Final answer
    x = 522.11

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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.