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Finding the Fourth Proportional to 1,128.19, 1,692.28 and 397.68

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Solution

The fourth proportional to 1,128.19, 1,692.28 and 397.68 is: 596.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.19 : 1,692.28 = 397.68 : x
  2. Step 2: Convert to fraction form
    1,128.19/1,692.28 = 397.68/x
  3. Step 3: Cross multiply
    1,128.19x = 1,692.28 × 397.68
  4. Step 4: Simplify right side
    1,128.19x = 672,985.91
  5. Step 5: Solve for x
    x = 672,985.91/1,128.19
  6. Step 6: Final answer
    x = 596.52

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Double scale
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1.5x scale

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.