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Finding the Fourth Proportional to 18,687.90, 28,042.65 and 7,002.30

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Solution

The fourth proportional to 18,687.90, 28,042.65 and 7,002.30 is: 10,507.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687.90 : 28,042.65 = 7,002.30 : x
  2. Step 2: Convert to fraction form
    18,687.90/28,042.65 = 7,002.30/x
  3. Step 3: Cross multiply
    18,687.90x = 28,042.65 × 7,002.30
  4. Step 4: Simplify right side
    18,687.90x = 196,363,048.10
  5. Step 5: Solve for x
    x = 196,363,048.10/18,687.90
  6. Step 6: Final answer
    x = 10,507.50

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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.