Home / 1,319.55-1,979.45-345.66

Finding the Fourth Proportional to 1,319.55, 1,979.45 and 345.66

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Solution

The fourth proportional to 1,319.55, 1,979.45 and 345.66 is: 518.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.55 : 1,979.45 = 345.66 : x
  2. Step 2: Convert to fraction form
    1,319.55/1,979.45 = 345.66/x
  3. Step 3: Cross multiply
    1,319.55x = 1,979.45 × 345.66
  4. Step 4: Simplify right side
    1,319.55x = 684,216.69
  5. Step 5: Solve for x
    x = 684,216.69/1,319.55
  6. Step 6: Final answer
    x = 518.52

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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.