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Finding the Fourth Proportional to 5,319.24, 7,978.86 and 1,809.60

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Solution

The fourth proportional to 5,319.24, 7,978.86 and 1,809.60 is: 2,714.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,319.24 : 7,978.86 = 1,809.60 : x
  2. Step 2: Convert to fraction form
    5,319.24/7,978.86 = 1,809.60/x
  3. Step 3: Cross multiply
    5,319.24x = 7,978.86 × 1,809.60
  4. Step 4: Simplify right side
    5,319.24x = 14,438,545.06
  5. Step 5: Solve for x
    x = 14,438,545.06/5,319.24
  6. Step 6: Final answer
    x = 2,714.40

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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.