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Finding the Fourth Proportional to 12,916.40, 19,374.60 and 11,312.60

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Solution

The fourth proportional to 12,916.40, 19,374.60 and 11,312.60 is: 16,968.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,916.40 : 19,374.60 = 11,312.60 : x
  2. Step 2: Convert to fraction form
    12,916.40/19,374.60 = 11,312.60/x
  3. Step 3: Cross multiply
    12,916.40x = 19,374.60 × 11,312.60
  4. Step 4: Simplify right side
    12,916.40x = 219,177,099.96
  5. Step 5: Solve for x
    x = 219,177,099.96/12,916.40
  6. Step 6: Final answer
    x = 16,968.90

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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.