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Finding the Fourth Proportional to 18,900.10, 28,351.52 and 7,807.46

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Solution

The fourth proportional to 18,900.10, 28,351.52 and 7,807.46 is: 11,711.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,900.10 : 28,351.52 = 7,807.46 : x
  2. Step 2: Convert to fraction form
    18,900.10/28,351.52 = 7,807.46/x
  3. Step 3: Cross multiply
    18,900.10x = 28,351.52 × 7,807.46
  4. Step 4: Simplify right side
    18,900.10x = 221,353,206.82
  5. Step 5: Solve for x
    x = 221,353,206.82/18,900.10
  6. Step 6: Final answer
    x = 11,711.75

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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.