Home / 100,128.78-138,178.08-55,416.78

Finding the Fourth Proportional to 100,128.78, 138,178.08 and 55,416.78

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Solution

The fourth proportional to 100,128.78, 138,178.08 and 55,416.78 is: 76,475.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,128.78 : 138,178.08 = 55,416.78 : x
  2. Step 2: Convert to fraction form
    100,128.78/138,178.08 = 55,416.78/x
  3. Step 3: Cross multiply
    100,128.78x = 138,178.08 × 55,416.78
  4. Step 4: Simplify right side
    100,128.78x = 7,657,384,260.18
  5. Step 5: Solve for x
    x = 7,657,384,260.18/100,128.78
  6. Step 6: Final answer
    x = 76,475.36

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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.