Home / 20,807.49-28,712.09-12,309.93

Finding the Fourth Proportional to 20,807.49, 28,712.09 and 12,309.93

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Solution

The fourth proportional to 20,807.49, 28,712.09 and 12,309.93 is: 16,986.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,807.49 : 28,712.09 = 12,309.93 : x
  2. Step 2: Convert to fraction form
    20,807.49/28,712.09 = 12,309.93/x
  3. Step 3: Cross multiply
    20,807.49x = 28,712.09 × 12,309.93
  4. Step 4: Simplify right side
    20,807.49x = 353,443,756.50
  5. Step 5: Solve for x
    x = 353,443,756.50/20,807.49
  6. Step 6: Final answer
    x = 16,986.37

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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.