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Finding the Fourth Proportional to 77,987.20, 117,009.60 and 75,107.20

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Solution

The fourth proportional to 77,987.20, 117,009.60 and 75,107.20 is: 112,688.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,987.20 : 117,009.60 = 75,107.20 : x
  2. Step 2: Convert to fraction form
    77,987.20/117,009.60 = 75,107.20/x
  3. Step 3: Cross multiply
    77,987.20x = 117,009.60 × 75,107.20
  4. Step 4: Simplify right side
    77,987.20x = 8,788,263,429.12
  5. Step 5: Solve for x
    x = 8,788,263,429.12/77,987.20
  6. Step 6: Final answer
    x = 112,688.54

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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.