Home / 78,112.94-117,145.20-28,186.58

Finding the Fourth Proportional to 78,112.94, 117,145.20 and 28,186.58

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Solution

The fourth proportional to 78,112.94, 117,145.20 and 28,186.58 is: 42,271.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,112.94 : 117,145.20 = 28,186.58 : x
  2. Step 2: Convert to fraction form
    78,112.94/117,145.20 = 28,186.58/x
  3. Step 3: Cross multiply
    78,112.94x = 117,145.20 × 28,186.58
  4. Step 4: Simplify right side
    78,112.94x = 3,301,922,551.42
  5. Step 5: Solve for x
    x = 3,301,922,551.42/78,112.94
  6. Step 6: Final answer
    x = 42,271.13

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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.