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Finding the Fourth Proportional to 84,978.10, 127,479.30 and 28,820.80

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Solution

The fourth proportional to 84,978.10, 127,479.30 and 28,820.80 is: 43,235.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,978.10 : 127,479.30 = 28,820.80 : x
  2. Step 2: Convert to fraction form
    84,978.10/127,479.30 = 28,820.80/x
  3. Step 3: Cross multiply
    84,978.10x = 127,479.30 × 28,820.80
  4. Step 4: Simplify right side
    84,978.10x = 3,674,055,409.44
  5. Step 5: Solve for x
    x = 3,674,055,409.44/84,978.10
  6. Step 6: Final answer
    x = 43,235.32

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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.