Home / 20,909.36-28,845.80-12,840.24

Finding the Fourth Proportional to 20,909.36, 28,845.80 and 12,840.24

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Solution

The fourth proportional to 20,909.36, 28,845.80 and 12,840.24 is: 17,713.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.36 : 28,845.80 = 12,840.24 : x
  2. Step 2: Convert to fraction form
    20,909.36/28,845.80 = 12,840.24/x
  3. Step 3: Cross multiply
    20,909.36x = 28,845.80 × 12,840.24
  4. Step 4: Simplify right side
    20,909.36x = 370,386,994.99
  5. Step 5: Solve for x
    x = 370,386,994.99/20,909.36
  6. Step 6: Final answer
    x = 17,713.93

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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.