Home / 78,390.75-108,181.20-42,580.74

Finding the Fourth Proportional to 78,390.75, 108,181.20 and 42,580.74

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Solution

The fourth proportional to 78,390.75, 108,181.20 and 42,580.74 is: 58,762.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,390.75 : 108,181.20 = 42,580.74 : x
  2. Step 2: Convert to fraction form
    78,390.75/108,181.20 = 42,580.74/x
  3. Step 3: Cross multiply
    78,390.75x = 108,181.20 × 42,580.74
  4. Step 4: Simplify right side
    78,390.75x = 4,606,435,550.09
  5. Step 5: Solve for x
    x = 4,606,435,550.09/78,390.75
  6. Step 6: Final answer
    x = 58,762.49

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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.