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Finding the Fourth Proportional to 15,078.88, 20,808.91 and 8,365.13

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Solution

The fourth proportional to 15,078.88, 20,808.91 and 8,365.13 is: 11,543.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,078.88 : 20,808.91 = 8,365.13 : x
  2. Step 2: Convert to fraction form
    15,078.88/20,808.91 = 8,365.13/x
  3. Step 3: Cross multiply
    15,078.88x = 20,808.91 × 8,365.13
  4. Step 4: Simplify right side
    15,078.88x = 174,069,237.31
  5. Step 5: Solve for x
    x = 174,069,237.31/15,078.88
  6. Step 6: Final answer
    x = 11,543.91

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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.