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Finding the Fourth Proportional to 18,916.60, 28,374.90 and 5,065.60

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Solution

The fourth proportional to 18,916.60, 28,374.90 and 5,065.60 is: 7,598.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,916.60 : 28,374.90 = 5,065.60 : x
  2. Step 2: Convert to fraction form
    18,916.60/28,374.90 = 5,065.60/x
  3. Step 3: Cross multiply
    18,916.60x = 28,374.90 × 5,065.60
  4. Step 4: Simplify right side
    18,916.60x = 143,735,893.44
  5. Step 5: Solve for x
    x = 143,735,893.44/18,916.60
  6. Step 6: Final answer
    x = 7,598.40

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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.