Home / 1,319.81-1,979.55-345.98

Finding the Fourth Proportional to 1,319.81, 1,979.55 and 345.98

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Solution

The fourth proportional to 1,319.81, 1,979.55 and 345.98 is: 518.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.81 : 1,979.55 = 345.98 : x
  2. Step 2: Convert to fraction form
    1,319.81/1,979.55 = 345.98/x
  3. Step 3: Cross multiply
    1,319.81x = 1,979.55 × 345.98
  4. Step 4: Simplify right side
    1,319.81x = 684,884.71
  5. Step 5: Solve for x
    x = 684,884.71/1,319.81
  6. Step 6: Final answer
    x = 518.93

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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.