Home / 78,390.21-108,178.70-42,579.93

Finding the Fourth Proportional to 78,390.21, 108,178.70 and 42,579.93

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Solution

The fourth proportional to 78,390.21, 108,178.70 and 42,579.93 is: 58,760.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,390.21 : 108,178.70 = 42,579.93 : x
  2. Step 2: Convert to fraction form
    78,390.21/108,178.70 = 42,579.93/x
  3. Step 3: Cross multiply
    78,390.21x = 108,178.70 × 42,579.93
  4. Step 4: Simplify right side
    78,390.21x = 4,606,241,260.59
  5. Step 5: Solve for x
    x = 4,606,241,260.59/78,390.21
  6. Step 6: Final answer
    x = 58,760.41

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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.