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Finding the Fourth Proportional to 18,989.16, 28,478.74 and 13,064.80

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Solution

The fourth proportional to 18,989.16, 28,478.74 and 13,064.80 is: 19,593.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.16 : 28,478.74 = 13,064.80 : x
  2. Step 2: Convert to fraction form
    18,989.16/28,478.74 = 13,064.80/x
  3. Step 3: Cross multiply
    18,989.16x = 28,478.74 × 13,064.80
  4. Step 4: Simplify right side
    18,989.16x = 372,069,042.35
  5. Step 5: Solve for x
    x = 372,069,042.35/18,989.16
  6. Step 6: Final answer
    x = 19,593.76

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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.