Home / 78,531.12-118,320.75-71,043.48

Finding the Fourth Proportional to 78,531.12, 118,320.75 and 71,043.48

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Solution

The fourth proportional to 78,531.12, 118,320.75 and 71,043.48 is: 107,039.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,531.12 : 118,320.75 = 71,043.48 : x
  2. Step 2: Convert to fraction form
    78,531.12/118,320.75 = 71,043.48/x
  3. Step 3: Cross multiply
    78,531.12x = 118,320.75 × 71,043.48
  4. Step 4: Simplify right side
    78,531.12x = 8,405,917,836.21
  5. Step 5: Solve for x
    x = 8,405,917,836.21/78,531.12
  6. Step 6: Final answer
    x = 107,039.32

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.