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Finding the Fourth Proportional to 13,305.80, 19,965.90 and 5,911.40

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Solution

The fourth proportional to 13,305.80, 19,965.90 and 5,911.40 is: 8,870.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,305.80 : 19,965.90 = 5,911.40 : x
  2. Step 2: Convert to fraction form
    13,305.80/19,965.90 = 5,911.40/x
  3. Step 3: Cross multiply
    13,305.80x = 19,965.90 × 5,911.40
  4. Step 4: Simplify right side
    13,305.80x = 118,026,421.26
  5. Step 5: Solve for x
    x = 118,026,421.26/13,305.80
  6. Step 6: Final answer
    x = 8,870.30

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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.