Home / 20,384.50-28,121.70-14,421.28

Finding the Fourth Proportional to 20,384.50, 28,121.70 and 14,421.28

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Solution

The fourth proportional to 20,384.50, 28,121.70 and 14,421.28 is: 19,895.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,384.50 : 28,121.70 = 14,421.28 : x
  2. Step 2: Convert to fraction form
    20,384.50/28,121.70 = 14,421.28/x
  3. Step 3: Cross multiply
    20,384.50x = 28,121.70 × 14,421.28
  4. Step 4: Simplify right side
    20,384.50x = 405,550,909.78
  5. Step 5: Solve for x
    x = 405,550,909.78/20,384.50
  6. Step 6: Final answer
    x = 19,895.06

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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.