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Finding the Fourth Proportional to 100,990.38, 139,315.44 and 77,075.52

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Solution

The fourth proportional to 100,990.38, 139,315.44 and 77,075.52 is: 106,325.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,990.38 : 139,315.44 = 77,075.52 : x
  2. Step 2: Convert to fraction form
    100,990.38/139,315.44 = 77,075.52/x
  3. Step 3: Cross multiply
    100,990.38x = 139,315.44 × 77,075.52
  4. Step 4: Simplify right side
    100,990.38x = 10,737,809,982.03
  5. Step 5: Solve for x
    x = 10,737,809,982.03/100,990.38
  6. Step 6: Final answer
    x = 106,325.08

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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.