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Finding the Fourth Proportional to 18,617.60, 25,664.64 and 12,319.04

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Solution

The fourth proportional to 18,617.60, 25,664.64 and 12,319.04 is: 16,981.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,617.60 : 25,664.64 = 12,319.04 : x
  2. Step 2: Convert to fraction form
    18,617.60/25,664.64 = 12,319.04/x
  3. Step 3: Cross multiply
    18,617.60x = 25,664.64 × 12,319.04
  4. Step 4: Simplify right side
    18,617.60x = 316,163,726.75
  5. Step 5: Solve for x
    x = 316,163,726.75/18,617.60
  6. Step 6: Final answer
    x = 16,981.98

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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.