Home / 1,319.49-1,979.08-345.67

Finding the Fourth Proportional to 1,319.49, 1,979.08 and 345.67

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Solution

The fourth proportional to 1,319.49, 1,979.08 and 345.67 is: 518.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.49 : 1,979.08 = 345.67 : x
  2. Step 2: Convert to fraction form
    1,319.49/1,979.08 = 345.67/x
  3. Step 3: Cross multiply
    1,319.49x = 1,979.08 × 345.67
  4. Step 4: Simplify right side
    1,319.49x = 684,104.72
  5. Step 5: Solve for x
    x = 684,104.72/1,319.49
  6. Step 6: Final answer
    x = 518.46

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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.