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Finding the Fourth Proportional to 139,125.76, 191,976.06 and 77,870.32

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Solution

The fourth proportional to 139,125.76, 191,976.06 and 77,870.32 is: 107,451.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,125.76 : 191,976.06 = 77,870.32 : x
  2. Step 2: Convert to fraction form
    139,125.76/191,976.06 = 77,870.32/x
  3. Step 3: Cross multiply
    139,125.76x = 191,976.06 × 77,870.32
  4. Step 4: Simplify right side
    139,125.76x = 14,949,237,224.54
  5. Step 5: Solve for x
    x = 14,949,237,224.54/139,125.76
  6. Step 6: Final answer
    x = 107,451.25

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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.