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Finding the Fourth Proportional to 20,986.70, 28,957.70 and 13,030.88

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Solution

The fourth proportional to 20,986.70, 28,957.70 and 13,030.88 is: 17,980.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.70 : 28,957.70 = 13,030.88 : x
  2. Step 2: Convert to fraction form
    20,986.70/28,957.70 = 13,030.88/x
  3. Step 3: Cross multiply
    20,986.70x = 28,957.70 × 13,030.88
  4. Step 4: Simplify right side
    20,986.70x = 377,344,201.56
  5. Step 5: Solve for x
    x = 377,344,201.56/20,986.70
  6. Step 6: Final answer
    x = 17,980.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.