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Finding the Fourth Proportional to 1,068.58, 1,603.10 and 338.21

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Solution

The fourth proportional to 1,068.58, 1,603.10 and 338.21 is: 507.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,068.58 : 1,603.10 = 338.21 : x
  2. Step 2: Convert to fraction form
    1,068.58/1,603.10 = 338.21/x
  3. Step 3: Cross multiply
    1,068.58x = 1,603.10 × 338.21
  4. Step 4: Simplify right side
    1,068.58x = 542,186.77
  5. Step 5: Solve for x
    x = 542,186.77/1,068.58
  6. Step 6: Final answer
    x = 507.39

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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.