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Finding the Fourth Proportional to 18,990.32, 28,484.06 and 7,437.89

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Solution

The fourth proportional to 18,990.32, 28,484.06 and 7,437.89 is: 11,156.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.32 : 28,484.06 = 7,437.89 : x
  2. Step 2: Convert to fraction form
    18,990.32/28,484.06 = 7,437.89/x
  3. Step 3: Cross multiply
    18,990.32x = 28,484.06 × 7,437.89
  4. Step 4: Simplify right side
    18,990.32x = 211,861,339.05
  5. Step 5: Solve for x
    x = 211,861,339.05/18,990.32
  6. Step 6: Final answer
    x = 11,156.28

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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.