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Finding the Fourth Proportional to 53,430, 80,146.08 and 13,990.56

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Solution

The fourth proportional to 53,430, 80,146.08 and 13,990.56 is: 20,986.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,430 : 80,146.08 = 13,990.56 : x
  2. Step 2: Convert to fraction form
    53,430/80,146.08 = 13,990.56/x
  3. Step 3: Cross multiply
    53,430x = 80,146.08 × 13,990.56
  4. Step 4: Simplify right side
    53,430x = 1,121,288,541.00
  5. Step 5: Solve for x
    x = 1,121,288,541.00/53,430
  6. Step 6: Final answer
    x = 20,986.12

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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.