Home / 100,430.20-138,589.03-55,107.06

Finding the Fourth Proportional to 100,430.20, 138,589.03 and 55,107.06

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Solution

The fourth proportional to 100,430.20, 138,589.03 and 55,107.06 is: 76,045.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,430.20 : 138,589.03 = 55,107.06 : x
  2. Step 2: Convert to fraction form
    100,430.20/138,589.03 = 55,107.06/x
  3. Step 3: Cross multiply
    100,430.20x = 138,589.03 × 55,107.06
  4. Step 4: Simplify right side
    100,430.20x = 7,637,233,991.55
  5. Step 5: Solve for x
    x = 7,637,233,991.55/100,430.20
  6. Step 6: Final answer
    x = 76,045.19

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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.