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Finding the Fourth Proportional to 100,962.21, 139,328.81 and 55,641.86

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Solution

The fourth proportional to 100,962.21, 139,328.81 and 55,641.86 is: 76,786.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,962.21 : 139,328.81 = 55,641.86 : x
  2. Step 2: Convert to fraction form
    100,962.21/139,328.81 = 55,641.86/x
  3. Step 3: Cross multiply
    100,962.21x = 139,328.81 × 55,641.86
  4. Step 4: Simplify right side
    100,962.21x = 7,752,514,139.99
  5. Step 5: Solve for x
    x = 7,752,514,139.99/100,962.21
  6. Step 6: Final answer
    x = 76,786.30

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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.