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Finding the Fourth Proportional to 18,990.16, 28,480.24 and 13,065.80

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Solution

The fourth proportional to 18,990.16, 28,480.24 and 13,065.80 is: 19,595.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.16 : 28,480.24 = 13,065.80 : x
  2. Step 2: Convert to fraction form
    18,990.16/28,480.24 = 13,065.80/x
  3. Step 3: Cross multiply
    18,990.16x = 28,480.24 × 13,065.80
  4. Step 4: Simplify right side
    18,990.16x = 372,117,119.79
  5. Step 5: Solve for x
    x = 372,117,119.79/18,990.16
  6. Step 6: Final answer
    x = 19,595.26

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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.