Home / 100,457.07-138,630.31-55,135.78

Finding the Fourth Proportional to 100,457.07, 138,630.31 and 55,135.78

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Solution

The fourth proportional to 100,457.07, 138,630.31 and 55,135.78 is: 76,087.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,457.07 : 138,630.31 = 55,135.78 : x
  2. Step 2: Convert to fraction form
    100,457.07/138,630.31 = 55,135.78/x
  3. Step 3: Cross multiply
    100,457.07x = 138,630.31 × 55,135.78
  4. Step 4: Simplify right side
    100,457.07x = 7,643,490,273.49
  5. Step 5: Solve for x
    x = 7,643,490,273.49/100,457.07
  6. Step 6: Final answer
    x = 76,087.13

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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.