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Finding the Fourth Proportional to 18,987.86, 28,492 and 7,902.20

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Solution

The fourth proportional to 18,987.86, 28,492 and 7,902.20 is: 11,857.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.86 : 28,492 = 7,902.20 : x
  2. Step 2: Convert to fraction form
    18,987.86/28,492 = 7,902.20/x
  3. Step 3: Cross multiply
    18,987.86x = 28,492 × 7,902.20
  4. Step 4: Simplify right side
    18,987.86x = 225,149,482.40
  5. Step 5: Solve for x
    x = 225,149,482.40/18,987.86
  6. Step 6: Final answer
    x = 11,857.55

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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.