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Finding the Fourth Proportional to 100,617.78, 138,845.84 and 55,294.80

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Solution

The fourth proportional to 100,617.78, 138,845.84 and 55,294.80 is: 76,303.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,617.78 : 138,845.84 = 55,294.80 : x
  2. Step 2: Convert to fraction form
    100,617.78/138,845.84 = 55,294.80/x
  3. Step 3: Cross multiply
    100,617.78x = 138,845.84 × 55,294.80
  4. Step 4: Simplify right side
    100,617.78x = 7,677,452,953.63
  5. Step 5: Solve for x
    x = 7,677,452,953.63/100,617.78
  6. Step 6: Final answer
    x = 76,303.14

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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.