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Finding the Fourth Proportional to 15,078.40, 20,807.40 and 8,363.50

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Solution

The fourth proportional to 15,078.40, 20,807.40 and 8,363.50 is: 11,541.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,078.40 : 20,807.40 = 8,363.50 : x
  2. Step 2: Convert to fraction form
    15,078.40/20,807.40 = 8,363.50/x
  3. Step 3: Cross multiply
    15,078.40x = 20,807.40 × 8,363.50
  4. Step 4: Simplify right side
    15,078.40x = 174,022,689.90
  5. Step 5: Solve for x
    x = 174,022,689.90/15,078.40
  6. Step 6: Final answer
    x = 11,541.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.