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Finding the Fourth Proportional to 15,078.09, 20,807.75 and 8,364.74

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Solution

The fourth proportional to 15,078.09, 20,807.75 and 8,364.74 is: 11,543.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,078.09 : 20,807.75 = 8,364.74 : x
  2. Step 2: Convert to fraction form
    15,078.09/20,807.75 = 8,364.74/x
  3. Step 3: Cross multiply
    15,078.09x = 20,807.75 × 8,364.74
  4. Step 4: Simplify right side
    15,078.09x = 174,051,272.87
  5. Step 5: Solve for x
    x = 174,051,272.87/15,078.09
  6. Step 6: Final answer
    x = 11,543.32

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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.