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Finding the Fourth Proportional to 100,737.78, 139,012.67 and 55,408.45

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Solution

The fourth proportional to 100,737.78, 139,012.67 and 55,408.45 is: 76,460.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,737.78 : 139,012.67 = 55,408.45 : x
  2. Step 2: Convert to fraction form
    100,737.78/139,012.67 = 55,408.45/x
  3. Step 3: Cross multiply
    100,737.78x = 139,012.67 × 55,408.45
  4. Step 4: Simplify right side
    100,737.78x = 7,702,476,575.06
  5. Step 5: Solve for x
    x = 7,702,476,575.06/100,737.78
  6. Step 6: Final answer
    x = 76,460.65

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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.