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Finding the Fourth Proportional to 18,989.78, 28,486.28 and 4,951.67

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Solution

The fourth proportional to 18,989.78, 28,486.28 and 4,951.67 is: 7,427.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.78 : 28,486.28 = 4,951.67 : x
  2. Step 2: Convert to fraction form
    18,989.78/28,486.28 = 4,951.67/x
  3. Step 3: Cross multiply
    18,989.78x = 28,486.28 × 4,951.67
  4. Step 4: Simplify right side
    18,989.78x = 141,054,528.04
  5. Step 5: Solve for x
    x = 141,054,528.04/18,989.78
  6. Step 6: Final answer
    x = 7,427.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.