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Finding the Fourth Proportional to 20,686.60, 31,029.90 and 14,125.60

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Solution

The fourth proportional to 20,686.60, 31,029.90 and 14,125.60 is: 21,188.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,686.60 : 31,029.90 = 14,125.60 : x
  2. Step 2: Convert to fraction form
    20,686.60/31,029.90 = 14,125.60/x
  3. Step 3: Cross multiply
    20,686.60x = 31,029.90 × 14,125.60
  4. Step 4: Simplify right side
    20,686.60x = 438,315,955.44
  5. Step 5: Solve for x
    x = 438,315,955.44/20,686.60
  6. Step 6: Final answer
    x = 21,188.40

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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.