Home / 18,990.30-28,499.70-7,155.76

Finding the Fourth Proportional to 18,990.30, 28,499.70 and 7,155.76

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Solution

The fourth proportional to 18,990.30, 28,499.70 and 7,155.76 is: 10,739.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.30 : 28,499.70 = 7,155.76 : x
  2. Step 2: Convert to fraction form
    18,990.30/28,499.70 = 7,155.76/x
  3. Step 3: Cross multiply
    18,990.30x = 28,499.70 × 7,155.76
  4. Step 4: Simplify right side
    18,990.30x = 203,937,013.27
  5. Step 5: Solve for x
    x = 203,937,013.27/18,990.30
  6. Step 6: Final answer
    x = 10,739.01

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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.