Home / 1,319.59-1,979.45-345.69

Finding the Fourth Proportional to 1,319.59, 1,979.45 and 345.69

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Solution

The fourth proportional to 1,319.59, 1,979.45 and 345.69 is: 518.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.59 : 1,979.45 = 345.69 : x
  2. Step 2: Convert to fraction form
    1,319.59/1,979.45 = 345.69/x
  3. Step 3: Cross multiply
    1,319.59x = 1,979.45 × 345.69
  4. Step 4: Simplify right side
    1,319.59x = 684,274.34
  5. Step 5: Solve for x
    x = 684,274.34/1,319.59
  6. Step 6: Final answer
    x = 518.55

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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.