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Finding the Fourth Proportional to 139,008.15, 191,841.21 and 78,583.77

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Solution

The fourth proportional to 139,008.15, 191,841.21 and 78,583.77 is: 108,451.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,008.15 : 191,841.21 = 78,583.77 : x
  2. Step 2: Convert to fraction form
    139,008.15/191,841.21 = 78,583.77/x
  3. Step 3: Cross multiply
    139,008.15x = 191,841.21 × 78,583.77
  4. Step 4: Simplify right side
    139,008.15x = 15,075,605,523.16
  5. Step 5: Solve for x
    x = 15,075,605,523.16/139,008.15
  6. Step 6: Final answer
    x = 108,451.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.