Home / 78,057.36-117,148.28-28,172.43

Finding the Fourth Proportional to 78,057.36, 117,148.28 and 28,172.43

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Solution

The fourth proportional to 78,057.36, 117,148.28 and 28,172.43 is: 42,281.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,057.36 : 117,148.28 = 28,172.43 : x
  2. Step 2: Convert to fraction form
    78,057.36/117,148.28 = 28,172.43/x
  3. Step 3: Cross multiply
    78,057.36x = 117,148.28 × 28,172.43
  4. Step 4: Simplify right side
    78,057.36x = 3,300,351,577.06
  5. Step 5: Solve for x
    x = 3,300,351,577.06/78,057.36
  6. Step 6: Final answer
    x = 42,281.11

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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.