Home / 20,385.94-28,117.90-12,428.50

Finding the Fourth Proportional to 20,385.94, 28,117.90 and 12,428.50

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Solution

The fourth proportional to 20,385.94, 28,117.90 and 12,428.50 is: 17,142.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.94 : 28,117.90 = 12,428.50 : x
  2. Step 2: Convert to fraction form
    20,385.94/28,117.90 = 12,428.50/x
  3. Step 3: Cross multiply
    20,385.94x = 28,117.90 × 12,428.50
  4. Step 4: Simplify right side
    20,385.94x = 349,463,320.15
  5. Step 5: Solve for x
    x = 349,463,320.15/20,385.94
  6. Step 6: Final answer
    x = 17,142.37

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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.