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Finding the Fourth Proportional to 30,663.87, 45,986.09 and 13,128.99

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Solution

The fourth proportional to 30,663.87, 45,986.09 and 13,128.99 is: 19,689.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,663.87 : 45,986.09 = 13,128.99 : x
  2. Step 2: Convert to fraction form
    30,663.87/45,986.09 = 13,128.99/x
  3. Step 3: Cross multiply
    30,663.87x = 45,986.09 × 13,128.99
  4. Step 4: Simplify right side
    30,663.87x = 603,750,850.10
  5. Step 5: Solve for x
    x = 603,750,850.10/30,663.87
  6. Step 6: Final answer
    x = 19,689.32

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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.