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Finding the Fourth Proportional to 9,879.40, 14,820 and 2,859.32

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Solution

The fourth proportional to 9,879.40, 14,820 and 2,859.32 is: 4,289.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,879.40 : 14,820 = 2,859.32 : x
  2. Step 2: Convert to fraction form
    9,879.40/14,820 = 2,859.32/x
  3. Step 3: Cross multiply
    9,879.40x = 14,820 × 2,859.32
  4. Step 4: Simplify right side
    9,879.40x = 42,375,122.40
  5. Step 5: Solve for x
    x = 42,375,122.40/9,879.40
  6. Step 6: Final answer
    x = 4,289.24

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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.