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Finding the Fourth Proportional to 18,585.60, 25,660.80 and 12,998.40

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Solution

The fourth proportional to 18,585.60, 25,660.80 and 12,998.40 is: 17,946.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,585.60 : 25,660.80 = 12,998.40 : x
  2. Step 2: Convert to fraction form
    18,585.60/25,660.80 = 12,998.40/x
  3. Step 3: Cross multiply
    18,585.60x = 25,660.80 × 12,998.40
  4. Step 4: Simplify right side
    18,585.60x = 333,549,342.72
  5. Step 5: Solve for x
    x = 333,549,342.72/18,585.60
  6. Step 6: Final answer
    x = 17,946.65

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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.