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Finding the Fourth Proportional to 18,478.60, 25,518.42 and 15,810.40

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Solution

The fourth proportional to 18,478.60, 25,518.42 and 15,810.40 is: 21,833.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,478.60 : 25,518.42 = 15,810.40 : x
  2. Step 2: Convert to fraction form
    18,478.60/25,518.42 = 15,810.40/x
  3. Step 3: Cross multiply
    18,478.60x = 25,518.42 × 15,810.40
  4. Step 4: Simplify right side
    18,478.60x = 403,456,427.57
  5. Step 5: Solve for x
    x = 403,456,427.57/18,478.60
  6. Step 6: Final answer
    x = 21,833.71

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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.