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Finding the Fourth Proportional to 77,900.80, 116,980.80 and 42,865.60

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Solution

The fourth proportional to 77,900.80, 116,980.80 and 42,865.60 is: 64,369.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,900.80 : 116,980.80 = 42,865.60 : x
  2. Step 2: Convert to fraction form
    77,900.80/116,980.80 = 42,865.60/x
  3. Step 3: Cross multiply
    77,900.80x = 116,980.80 × 42,865.60
  4. Step 4: Simplify right side
    77,900.80x = 5,014,452,180.48
  5. Step 5: Solve for x
    x = 5,014,452,180.48/77,900.80
  6. Step 6: Final answer
    x = 64,369.71

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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.