Home / 138,944.21-191,740.47-78,513.55

Finding the Fourth Proportional to 138,944.21, 191,740.47 and 78,513.55

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Solution

The fourth proportional to 138,944.21, 191,740.47 and 78,513.55 is: 108,347.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,944.21 : 191,740.47 = 78,513.55 : x
  2. Step 2: Convert to fraction form
    138,944.21/191,740.47 = 78,513.55/x
  3. Step 3: Cross multiply
    138,944.21x = 191,740.47 × 78,513.55
  4. Step 4: Simplify right side
    138,944.21x = 15,054,225,283.13
  5. Step 5: Solve for x
    x = 15,054,225,283.13/138,944.21
  6. Step 6: Final answer
    x = 108,347.27

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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.