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Finding the Fourth Proportional to 139,970.40, 193,343.52 and 103,745.28

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Solution

The fourth proportional to 139,970.40, 193,343.52 and 103,745.28 is: 143,305.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,970.40 : 193,343.52 = 103,745.28 : x
  2. Step 2: Convert to fraction form
    139,970.40/193,343.52 = 103,745.28/x
  3. Step 3: Cross multiply
    139,970.40x = 193,343.52 × 103,745.28
  4. Step 4: Simplify right side
    139,970.40x = 20,058,477,618.59
  5. Step 5: Solve for x
    x = 20,058,477,618.59/139,970.40
  6. Step 6: Final answer
    x = 143,305.14

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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.