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Finding the Fourth Proportional to 1,069.82, 1,605.01 and 339.40

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Solution

The fourth proportional to 1,069.82, 1,605.01 and 339.40 is: 509.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.82 : 1,605.01 = 339.40 : x
  2. Step 2: Convert to fraction form
    1,069.82/1,605.01 = 339.40/x
  3. Step 3: Cross multiply
    1,069.82x = 1,605.01 × 339.40
  4. Step 4: Simplify right side
    1,069.82x = 544,740.39
  5. Step 5: Solve for x
    x = 544,740.39/1,069.82
  6. Step 6: Final answer
    x = 509.19

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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.