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Finding the Fourth Proportional to 13,319.20, 19,978.80 and 4,085.20

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Solution

The fourth proportional to 13,319.20, 19,978.80 and 4,085.20 is: 6,127.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,319.20 : 19,978.80 = 4,085.20 : x
  2. Step 2: Convert to fraction form
    13,319.20/19,978.80 = 4,085.20/x
  3. Step 3: Cross multiply
    13,319.20x = 19,978.80 × 4,085.20
  4. Step 4: Simplify right side
    13,319.20x = 81,617,393.76
  5. Step 5: Solve for x
    x = 81,617,393.76/13,319.20
  6. Step 6: Final answer
    x = 6,127.80

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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.