Home / 20,511.39-28,307.85-12,558.90

Finding the Fourth Proportional to 20,511.39, 28,307.85 and 12,558.90

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Solution

The fourth proportional to 20,511.39, 28,307.85 and 12,558.90 is: 17,332.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,511.39 : 28,307.85 = 12,558.90 : x
  2. Step 2: Convert to fraction form
    20,511.39/28,307.85 = 12,558.90/x
  3. Step 3: Cross multiply
    20,511.39x = 28,307.85 × 12,558.90
  4. Step 4: Simplify right side
    20,511.39x = 355,515,457.37
  5. Step 5: Solve for x
    x = 355,515,457.37/20,511.39
  6. Step 6: Final answer
    x = 17,332.59

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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.