Home / 1,319.86-1,979.12-442.06

Finding the Fourth Proportional to 1,319.86, 1,979.12 and 442.06

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Solution

The fourth proportional to 1,319.86, 1,979.12 and 442.06 is: 662.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.86 : 1,979.12 = 442.06 : x
  2. Step 2: Convert to fraction form
    1,319.86/1,979.12 = 442.06/x
  3. Step 3: Cross multiply
    1,319.86x = 1,979.12 × 442.06
  4. Step 4: Simplify right side
    1,319.86x = 874,889.79
  5. Step 5: Solve for x
    x = 874,889.79/1,319.86
  6. Step 6: Final answer
    x = 662.87

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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.