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Finding the Fourth Proportional to 30,659.75, 45,979.90 and 13,124.87

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Solution

The fourth proportional to 30,659.75, 45,979.90 and 13,124.87 is: 19,683.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,659.75 : 45,979.90 = 13,124.87 : x
  2. Step 2: Convert to fraction form
    30,659.75/45,979.90 = 13,124.87/x
  3. Step 3: Cross multiply
    30,659.75x = 45,979.90 × 13,124.87
  4. Step 4: Simplify right side
    30,659.75x = 603,479,947.40
  5. Step 5: Solve for x
    x = 603,479,947.40/30,659.75
  6. Step 6: Final answer
    x = 19,683.14

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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.