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Finding the Fourth Proportional to 77,012.60, 115,518.90 and 72,404.60

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Solution

The fourth proportional to 77,012.60, 115,518.90 and 72,404.60 is: 108,606.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,012.60 : 115,518.90 = 72,404.60 : x
  2. Step 2: Convert to fraction form
    77,012.60/115,518.90 = 72,404.60/x
  3. Step 3: Cross multiply
    77,012.60x = 115,518.90 × 72,404.60
  4. Step 4: Simplify right side
    77,012.60x = 8,364,099,746.94
  5. Step 5: Solve for x
    x = 8,364,099,746.94/77,012.60
  6. Step 6: Final answer
    x = 108,606.90

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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.