Home / 78,278.63-117,411.55-30,891.80

Finding the Fourth Proportional to 78,278.63, 117,411.55 and 30,891.80

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Solution

The fourth proportional to 78,278.63, 117,411.55 and 30,891.80 is: 46,335.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,278.63 : 117,411.55 = 30,891.80 : x
  2. Step 2: Convert to fraction form
    78,278.63/117,411.55 = 30,891.80/x
  3. Step 3: Cross multiply
    78,278.63x = 117,411.55 × 30,891.80
  4. Step 4: Simplify right side
    78,278.63x = 3,627,054,336.59
  5. Step 5: Solve for x
    x = 3,627,054,336.59/78,278.63
  6. Step 6: Final answer
    x = 46,335.18

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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.