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Finding the Fourth Proportional to 1,068.95, 1,603.43 and 338.60

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Solution

The fourth proportional to 1,068.95, 1,603.43 and 338.60 is: 507.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,068.95 : 1,603.43 = 338.60 : x
  2. Step 2: Convert to fraction form
    1,068.95/1,603.43 = 338.60/x
  3. Step 3: Cross multiply
    1,068.95x = 1,603.43 × 338.60
  4. Step 4: Simplify right side
    1,068.95x = 542,911.69
  5. Step 5: Solve for x
    x = 542,911.69/1,068.95
  6. Step 6: Final answer
    x = 507.89

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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.