Home / 78,578.41-108,438.20-42,768.68

Finding the Fourth Proportional to 78,578.41, 108,438.20 and 42,768.68

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Solution

The fourth proportional to 78,578.41, 108,438.20 and 42,768.68 is: 59,020.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,578.41 : 108,438.20 = 42,768.68 : x
  2. Step 2: Convert to fraction form
    78,578.41/108,438.20 = 42,768.68/x
  3. Step 3: Cross multiply
    78,578.41x = 108,438.20 × 42,768.68
  4. Step 4: Simplify right side
    78,578.41x = 4,637,758,745.25
  5. Step 5: Solve for x
    x = 4,637,758,745.25/78,578.41
  6. Step 6: Final answer
    x = 59,020.78

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1.5x scale

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.