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Finding the Fourth Proportional to 51,116.80, 70,541.04 and 28,760.80

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Solution

The fourth proportional to 51,116.80, 70,541.04 and 28,760.80 is: 39,689.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,116.80 : 70,541.04 = 28,760.80 : x
  2. Step 2: Convert to fraction form
    51,116.80/70,541.04 = 28,760.80/x
  3. Step 3: Cross multiply
    51,116.80x = 70,541.04 × 28,760.80
  4. Step 4: Simplify right side
    51,116.80x = 2,028,816,743.23
  5. Step 5: Solve for x
    x = 2,028,816,743.23/51,116.80
  6. Step 6: Final answer
    x = 39,689.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.