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Finding the Fourth Proportional to 1,119.36, 1,679.10 and 339.42

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Solution

The fourth proportional to 1,119.36, 1,679.10 and 339.42 is: 509.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.36 : 1,679.10 = 339.42 : x
  2. Step 2: Convert to fraction form
    1,119.36/1,679.10 = 339.42/x
  3. Step 3: Cross multiply
    1,119.36x = 1,679.10 × 339.42
  4. Step 4: Simplify right side
    1,119.36x = 569,920.12
  5. Step 5: Solve for x
    x = 569,920.12/1,119.36
  6. Step 6: Final answer
    x = 509.15

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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.