Home / 20,428.50-28,191.33-12,989.46

Finding the Fourth Proportional to 20,428.50, 28,191.33 and 12,989.46

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Solution

The fourth proportional to 20,428.50, 28,191.33 and 12,989.46 is: 17,925.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,428.50 : 28,191.33 = 12,989.46 : x
  2. Step 2: Convert to fraction form
    20,428.50/28,191.33 = 12,989.46/x
  3. Step 3: Cross multiply
    20,428.50x = 28,191.33 × 12,989.46
  4. Step 4: Simplify right side
    20,428.50x = 366,190,153.38
  5. Step 5: Solve for x
    x = 366,190,153.38/20,428.50
  6. Step 6: Final answer
    x = 17,925.45

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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.