Home / 20,905.88-28,855.64-12,943.58

Finding the Fourth Proportional to 20,905.88, 28,855.64 and 12,943.58

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Solution

The fourth proportional to 20,905.88, 28,855.64 and 12,943.58 is: 17,865.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.88 : 28,855.64 = 12,943.58 : x
  2. Step 2: Convert to fraction form
    20,905.88/28,855.64 = 12,943.58/x
  3. Step 3: Cross multiply
    20,905.88x = 28,855.64 × 12,943.58
  4. Step 4: Simplify right side
    20,905.88x = 373,495,284.79
  5. Step 5: Solve for x
    x = 373,495,284.79/20,905.88
  6. Step 6: Final answer
    x = 17,865.56

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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.