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Finding the Fourth Proportional to 10,686.20, 15,986.10 and 9,390.20

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Solution

The fourth proportional to 10,686.20, 15,986.10 and 9,390.20 is: 14,047.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,686.20 : 15,986.10 = 9,390.20 : x
  2. Step 2: Convert to fraction form
    10,686.20/15,986.10 = 9,390.20/x
  3. Step 3: Cross multiply
    10,686.20x = 15,986.10 × 9,390.20
  4. Step 4: Simplify right side
    10,686.20x = 150,112,676.22
  5. Step 5: Solve for x
    x = 150,112,676.22/10,686.20
  6. Step 6: Final answer
    x = 14,047.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.