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Finding the Fourth Proportional to 13,805.65, 20,708.48 and 3,417.40

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Solution

The fourth proportional to 13,805.65, 20,708.48 and 3,417.40 is: 5,126.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,805.65 : 20,708.48 = 3,417.40 : x
  2. Step 2: Convert to fraction form
    13,805.65/20,708.48 = 3,417.40/x
  3. Step 3: Cross multiply
    13,805.65x = 20,708.48 × 3,417.40
  4. Step 4: Simplify right side
    13,805.65x = 70,769,193.98
  5. Step 5: Solve for x
    x = 70,769,193.98/13,805.65
  6. Step 6: Final answer
    x = 5,126.10

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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.