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Finding the Fourth Proportional to 53,980.20, 80,931.90 and 20,687.40

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Solution

The fourth proportional to 53,980.20, 80,931.90 and 20,687.40 is: 31,016.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,980.20 : 80,931.90 = 20,687.40 : x
  2. Step 2: Convert to fraction form
    53,980.20/80,931.90 = 20,687.40/x
  3. Step 3: Cross multiply
    53,980.20x = 80,931.90 × 20,687.40
  4. Step 4: Simplify right side
    53,980.20x = 1,674,270,588.06
  5. Step 5: Solve for x
    x = 1,674,270,588.06/53,980.20
  6. Step 6: Final answer
    x = 31,016.38

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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.