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Finding the Fourth Proportional to 100,650.21, 138,899.01 and 55,330.10

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Solution

The fourth proportional to 100,650.21, 138,899.01 and 55,330.10 is: 76,356.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,650.21 : 138,899.01 = 55,330.10 : x
  2. Step 2: Convert to fraction form
    100,650.21/138,899.01 = 55,330.10/x
  3. Step 3: Cross multiply
    100,650.21x = 138,899.01 × 55,330.10
  4. Step 4: Simplify right side
    100,650.21x = 7,685,296,113.20
  5. Step 5: Solve for x
    x = 7,685,296,113.20/100,650.21
  6. Step 6: Final answer
    x = 76,356.49

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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.