Home / 20,369.79-28,109.93-11,417.40

Finding the Fourth Proportional to 20,369.79, 28,109.93 and 11,417.40

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Solution

The fourth proportional to 20,369.79, 28,109.93 and 11,417.40 is: 15,755.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,369.79 : 28,109.93 = 11,417.40 : x
  2. Step 2: Convert to fraction form
    20,369.79/28,109.93 = 11,417.40/x
  3. Step 3: Cross multiply
    20,369.79x = 28,109.93 × 11,417.40
  4. Step 4: Simplify right side
    20,369.79x = 320,942,257.70
  5. Step 5: Solve for x
    x = 320,942,257.70/20,369.79
  6. Step 6: Final answer
    x = 15,755.80

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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.