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Finding the Fourth Proportional to 12,916.80, 19,375.20 and 7,387.20

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Solution

The fourth proportional to 12,916.80, 19,375.20 and 7,387.20 is: 11,080.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,916.80 : 19,375.20 = 7,387.20 : x
  2. Step 2: Convert to fraction form
    12,916.80/19,375.20 = 7,387.20/x
  3. Step 3: Cross multiply
    12,916.80x = 19,375.20 × 7,387.20
  4. Step 4: Simplify right side
    12,916.80x = 143,128,477.44
  5. Step 5: Solve for x
    x = 143,128,477.44/12,916.80
  6. Step 6: Final answer
    x = 11,080.80

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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.