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Finding the Fourth Proportional to 139,054.58, 191,894.14 and 78,637.08

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Solution

The fourth proportional to 139,054.58, 191,894.14 and 78,637.08 is: 108,518.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,054.58 : 191,894.14 = 78,637.08 : x
  2. Step 2: Convert to fraction form
    139,054.58/191,894.14 = 78,637.08/x
  3. Step 3: Cross multiply
    139,054.58x = 191,894.14 × 78,637.08
  4. Step 4: Simplify right side
    139,054.58x = 15,089,994,838.71
  5. Step 5: Solve for x
    x = 15,089,994,838.71/139,054.58
  6. Step 6: Final answer
    x = 108,518.50

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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.