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Finding the Fourth Proportional to 13,710.80, 20,561.40 and 7,134.80

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Solution

The fourth proportional to 13,710.80, 20,561.40 and 7,134.80 is: 10,699.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,710.80 : 20,561.40 = 7,134.80 : x
  2. Step 2: Convert to fraction form
    13,710.80/20,561.40 = 7,134.80/x
  3. Step 3: Cross multiply
    13,710.80x = 20,561.40 × 7,134.80
  4. Step 4: Simplify right side
    13,710.80x = 146,701,476.72
  5. Step 5: Solve for x
    x = 146,701,476.72/13,710.80
  6. Step 6: Final answer
    x = 10,699.70

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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.