Home / 1,319.49-1,979.35-345.60

Finding the Fourth Proportional to 1,319.49, 1,979.35 and 345.60

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Solution

The fourth proportional to 1,319.49, 1,979.35 and 345.60 is: 518.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.49 : 1,979.35 = 345.60 : x
  2. Step 2: Convert to fraction form
    1,319.49/1,979.35 = 345.60/x
  3. Step 3: Cross multiply
    1,319.49x = 1,979.35 × 345.60
  4. Step 4: Simplify right side
    1,319.49x = 684,053.46
  5. Step 5: Solve for x
    x = 684,053.46/1,319.49
  6. Step 6: Final answer
    x = 518.42

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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.