Home / 78,778.80-117,980.28-45,429.12

Finding the Fourth Proportional to 78,778.80, 117,980.28 and 45,429.12

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Solution

The fourth proportional to 78,778.80, 117,980.28 and 45,429.12 is: 68,035.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,778.80 : 117,980.28 = 45,429.12 : x
  2. Step 2: Convert to fraction form
    78,778.80/117,980.28 = 45,429.12/x
  3. Step 3: Cross multiply
    78,778.80x = 117,980.28 × 45,429.12
  4. Step 4: Simplify right side
    78,778.80x = 5,359,740,297.75
  5. Step 5: Solve for x
    x = 5,359,740,297.75/78,778.80
  6. Step 6: Final answer
    x = 68,035.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.