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Finding the Fourth Proportional to 20,615.60, 30,905.40 and 14,020.40

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Solution

The fourth proportional to 20,615.60, 30,905.40 and 14,020.40 is: 21,018.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,615.60 : 30,905.40 = 14,020.40 : x
  2. Step 2: Convert to fraction form
    20,615.60/30,905.40 = 14,020.40/x
  3. Step 3: Cross multiply
    20,615.60x = 30,905.40 × 14,020.40
  4. Step 4: Simplify right side
    20,615.60x = 433,306,070.16
  5. Step 5: Solve for x
    x = 433,306,070.16/20,615.60
  6. Step 6: Final answer
    x = 21,018.36

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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.