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Finding the Fourth Proportional to 84,042.88, 115,978.80 and 45,804.64

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Solution

The fourth proportional to 84,042.88, 115,978.80 and 45,804.64 is: 63,210.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,042.88 : 115,978.80 = 45,804.64 : x
  2. Step 2: Convert to fraction form
    84,042.88/115,978.80 = 45,804.64/x
  3. Step 3: Cross multiply
    84,042.88x = 115,978.80 × 45,804.64
  4. Step 4: Simplify right side
    84,042.88x = 5,312,367,181.63
  5. Step 5: Solve for x
    x = 5,312,367,181.63/84,042.88
  6. Step 6: Final answer
    x = 63,210.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.