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Finding the Fourth Proportional to 53,160.60, 79,743.78 and 19,889.40

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Solution

The fourth proportional to 53,160.60, 79,743.78 and 19,889.40 is: 29,835.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,160.60 : 79,743.78 = 19,889.40 : x
  2. Step 2: Convert to fraction form
    53,160.60/79,743.78 = 19,889.40/x
  3. Step 3: Cross multiply
    53,160.60x = 79,743.78 × 19,889.40
  4. Step 4: Simplify right side
    53,160.60x = 1,586,055,937.93
  5. Step 5: Solve for x
    x = 1,586,055,937.93/53,160.60
  6. Step 6: Final answer
    x = 29,835.18

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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.