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Finding the Fourth Proportional to 18,615.60, 25,661.88 and 12,317.04

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Solution

The fourth proportional to 18,615.60, 25,661.88 and 12,317.04 is: 16,979.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,615.60 : 25,661.88 = 12,317.04 : x
  2. Step 2: Convert to fraction form
    18,615.60/25,661.88 = 12,317.04/x
  3. Step 3: Cross multiply
    18,615.60x = 25,661.88 × 12,317.04
  4. Step 4: Simplify right side
    18,615.60x = 316,078,402.44
  5. Step 5: Solve for x
    x = 316,078,402.44/18,615.60
  6. Step 6: Final answer
    x = 16,979.22

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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.