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Finding the Fourth Proportional to 53,129.72, 79,696.78 and 15,689.80

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Solution

The fourth proportional to 53,129.72, 79,696.78 and 15,689.80 is: 23,535.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,129.72 : 79,696.78 = 15,689.80 : x
  2. Step 2: Convert to fraction form
    53,129.72/79,696.78 = 15,689.80/x
  3. Step 3: Cross multiply
    53,129.72x = 79,696.78 × 15,689.80
  4. Step 4: Simplify right side
    53,129.72x = 1,250,426,538.84
  5. Step 5: Solve for x
    x = 1,250,426,538.84/53,129.72
  6. Step 6: Final answer
    x = 23,535.35

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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.