Home / 139,728.83-192,825.21-78,466.50

Finding the Fourth Proportional to 139,728.83, 192,825.21 and 78,466.50

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Solution

The fourth proportional to 139,728.83, 192,825.21 and 78,466.50 is: 108,283.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,728.83 : 192,825.21 = 78,466.50 : x
  2. Step 2: Convert to fraction form
    139,728.83/192,825.21 = 78,466.50/x
  3. Step 3: Cross multiply
    139,728.83x = 192,825.21 × 78,466.50
  4. Step 4: Simplify right side
    139,728.83x = 15,130,319,340.47
  5. Step 5: Solve for x
    x = 15,130,319,340.47/139,728.83
  6. Step 6: Final answer
    x = 108,283.45

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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.