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Finding the Fourth Proportional to 15,139.74, 20,895.06 and 9,090.40

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Solution

The fourth proportional to 15,139.74, 20,895.06 and 9,090.40 is: 12,546.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,139.74 : 20,895.06 = 9,090.40 : x
  2. Step 2: Convert to fraction form
    15,139.74/20,895.06 = 9,090.40/x
  3. Step 3: Cross multiply
    15,139.74x = 20,895.06 × 9,090.40
  4. Step 4: Simplify right side
    15,139.74x = 189,944,453.42
  5. Step 5: Solve for x
    x = 189,944,453.42/15,139.74
  6. Step 6: Final answer
    x = 12,546.08

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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.