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Finding the Fourth Proportional to 13,986.90, 20,980.35 and 4,752.90

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Solution

The fourth proportional to 13,986.90, 20,980.35 and 4,752.90 is: 7,129.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,986.90 : 20,980.35 = 4,752.90 : x
  2. Step 2: Convert to fraction form
    13,986.90/20,980.35 = 4,752.90/x
  3. Step 3: Cross multiply
    13,986.90x = 20,980.35 × 4,752.90
  4. Step 4: Simplify right side
    13,986.90x = 99,717,505.52
  5. Step 5: Solve for x
    x = 99,717,505.52/13,986.90
  6. Step 6: Final answer
    x = 7,129.35

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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.