Home / 15,145.12-20,900.05-8,430.74

Finding the Fourth Proportional to 15,145.12, 20,900.05 and 8,430.74

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Solution

The fourth proportional to 15,145.12, 20,900.05 and 8,430.74 is: 11,634.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,145.12 : 20,900.05 = 8,430.74 : x
  2. Step 2: Convert to fraction form
    15,145.12/20,900.05 = 8,430.74/x
  3. Step 3: Cross multiply
    15,145.12x = 20,900.05 × 8,430.74
  4. Step 4: Simplify right side
    15,145.12x = 176,202,887.54
  5. Step 5: Solve for x
    x = 176,202,887.54/15,145.12
  6. Step 6: Final answer
    x = 11,634.30

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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.