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Finding the Fourth Proportional to 15,135.74, 20,879.05 and 9,674.58

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Solution

The fourth proportional to 15,135.74, 20,879.05 and 9,674.58 is: 13,345.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.74 : 20,879.05 = 9,674.58 : x
  2. Step 2: Convert to fraction form
    15,135.74/20,879.05 = 9,674.58/x
  3. Step 3: Cross multiply
    15,135.74x = 20,879.05 × 9,674.58
  4. Step 4: Simplify right side
    15,135.74x = 201,996,039.55
  5. Step 5: Solve for x
    x = 201,996,039.55/15,135.74
  6. Step 6: Final answer
    x = 13,345.63

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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.