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Finding the Fourth Proportional to 18,813.60, 28,220.40 and 15,530.40

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Solution

The fourth proportional to 18,813.60, 28,220.40 and 15,530.40 is: 23,295.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,813.60 : 28,220.40 = 15,530.40 : x
  2. Step 2: Convert to fraction form
    18,813.60/28,220.40 = 15,530.40/x
  3. Step 3: Cross multiply
    18,813.60x = 28,220.40 × 15,530.40
  4. Step 4: Simplify right side
    18,813.60x = 438,274,100.16
  5. Step 5: Solve for x
    x = 438,274,100.16/18,813.60
  6. Step 6: Final answer
    x = 23,295.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.