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Finding the Fourth Proportional to 8,988.91, 13,489.34 and 3,145.50

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Solution

The fourth proportional to 8,988.91, 13,489.34 and 3,145.50 is: 4,720.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,988.91 : 13,489.34 = 3,145.50 : x
  2. Step 2: Convert to fraction form
    8,988.91/13,489.34 = 3,145.50/x
  3. Step 3: Cross multiply
    8,988.91x = 13,489.34 × 3,145.50
  4. Step 4: Simplify right side
    8,988.91x = 42,430,703.24
  5. Step 5: Solve for x
    x = 42,430,703.24/8,988.91
  6. Step 6: Final answer
    x = 4,720.34

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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.