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Finding the Fourth Proportional to 139,888.19, 193,039.65 and 79,458.64

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Solution

The fourth proportional to 139,888.19, 193,039.65 and 79,458.64 is: 109,649.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,888.19 : 193,039.65 = 79,458.64 : x
  2. Step 2: Convert to fraction form
    139,888.19/193,039.65 = 79,458.64/x
  3. Step 3: Cross multiply
    139,888.19x = 193,039.65 × 79,458.64
  4. Step 4: Simplify right side
    139,888.19x = 15,338,668,055.08
  5. Step 5: Solve for x
    x = 15,338,668,055.08/139,888.19
  6. Step 6: Final answer
    x = 109,649.49

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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.