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Finding the Fourth Proportional to 77,720.80, 116,504.40 and 30,911.20

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Solution

The fourth proportional to 77,720.80, 116,504.40 and 30,911.20 is: 46,336.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,720.80 : 116,504.40 = 30,911.20 : x
  2. Step 2: Convert to fraction form
    77,720.80/116,504.40 = 30,911.20/x
  3. Step 3: Cross multiply
    77,720.80x = 116,504.40 × 30,911.20
  4. Step 4: Simplify right side
    77,720.80x = 3,601,290,809.28
  5. Step 5: Solve for x
    x = 3,601,290,809.28/77,720.80
  6. Step 6: Final answer
    x = 46,336.26

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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.