Home / 15,089.40-20,820.15-9,119.88

Finding the Fourth Proportional to 15,089.40, 20,820.15 and 9,119.88

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Solution

The fourth proportional to 15,089.40, 20,820.15 and 9,119.88 is: 12,583.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,089.40 : 20,820.15 = 9,119.88 : x
  2. Step 2: Convert to fraction form
    15,089.40/20,820.15 = 9,119.88/x
  3. Step 3: Cross multiply
    15,089.40x = 20,820.15 × 9,119.88
  4. Step 4: Simplify right side
    15,089.40x = 189,877,269.58
  5. Step 5: Solve for x
    x = 189,877,269.58/15,089.40
  6. Step 6: Final answer
    x = 12,583.49

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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.