Home / 100,457.28-138,629.58-57,436.32

Finding the Fourth Proportional to 100,457.28, 138,629.58 and 57,436.32

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Solution

The fourth proportional to 100,457.28, 138,629.58 and 57,436.32 is: 79,261.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,457.28 : 138,629.58 = 57,436.32 : x
  2. Step 2: Convert to fraction form
    100,457.28/138,629.58 = 57,436.32/x
  3. Step 3: Cross multiply
    100,457.28x = 138,629.58 × 57,436.32
  4. Step 4: Simplify right side
    100,457.28x = 7,962,372,918.35
  5. Step 5: Solve for x
    x = 7,962,372,918.35/100,457.28
  6. Step 6: Final answer
    x = 79,261.28

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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.