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Finding the Fourth Proportional to 14,943.60, 20,623.98 and 8,978.40

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Solution

The fourth proportional to 14,943.60, 20,623.98 and 8,978.40 is: 12,391.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,943.60 : 20,623.98 = 8,978.40 : x
  2. Step 2: Convert to fraction form
    14,943.60/20,623.98 = 8,978.40/x
  3. Step 3: Cross multiply
    14,943.60x = 20,623.98 × 8,978.40
  4. Step 4: Simplify right side
    14,943.60x = 185,170,342.03
  5. Step 5: Solve for x
    x = 185,170,342.03/14,943.60
  6. Step 6: Final answer
    x = 12,391.28

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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.