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Finding the Fourth Proportional to 18,948.73, 28,423.20 and 4,907.78

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Solution

The fourth proportional to 18,948.73, 28,423.20 and 4,907.78 is: 7,361.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,948.73 : 28,423.20 = 4,907.78 : x
  2. Step 2: Convert to fraction form
    18,948.73/28,423.20 = 4,907.78/x
  3. Step 3: Cross multiply
    18,948.73x = 28,423.20 × 4,907.78
  4. Step 4: Simplify right side
    18,948.73x = 139,494,812.50
  5. Step 5: Solve for x
    x = 139,494,812.50/18,948.73
  6. Step 6: Final answer
    x = 7,361.70

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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.