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Finding the Fourth Proportional to 78,400.20, 117,600.30 and 77,104.20

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Solution

The fourth proportional to 78,400.20, 117,600.30 and 77,104.20 is: 115,656.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,400.20 : 117,600.30 = 77,104.20 : x
  2. Step 2: Convert to fraction form
    78,400.20/117,600.30 = 77,104.20/x
  3. Step 3: Cross multiply
    78,400.20x = 117,600.30 × 77,104.20
  4. Step 4: Simplify right side
    78,400.20x = 9,067,477,051.26
  5. Step 5: Solve for x
    x = 9,067,477,051.26/78,400.20
  6. Step 6: Final answer
    x = 115,656.30

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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.