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Finding the Fourth Proportional to 18,987.40, 28,484.18 and 7,142.10

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Solution

The fourth proportional to 18,987.40, 28,484.18 and 7,142.10 is: 10,714.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.40 : 28,484.18 = 7,142.10 : x
  2. Step 2: Convert to fraction form
    18,987.40/28,484.18 = 7,142.10/x
  3. Step 3: Cross multiply
    18,987.40x = 28,484.18 × 7,142.10
  4. Step 4: Simplify right side
    18,987.40x = 203,436,861.98
  5. Step 5: Solve for x
    x = 203,436,861.98/18,987.40
  6. Step 6: Final answer
    x = 10,714.31

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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.