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Finding the Fourth Proportional to 18,538.40, 27,807.70 and 4,687.40

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Solution

The fourth proportional to 18,538.40, 27,807.70 and 4,687.40 is: 7,031.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,538.40 : 27,807.70 = 4,687.40 : x
  2. Step 2: Convert to fraction form
    18,538.40/27,807.70 = 4,687.40/x
  3. Step 3: Cross multiply
    18,538.40x = 27,807.70 × 4,687.40
  4. Step 4: Simplify right side
    18,538.40x = 130,345,812.98
  5. Step 5: Solve for x
    x = 130,345,812.98/18,538.40
  6. Step 6: Final answer
    x = 7,031.13

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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.