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Finding the Fourth Proportional to 171,805.47, 257,445.15 and 71,911.28

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Solution

The fourth proportional to 171,805.47, 257,445.15 and 71,911.28 is: 107,756.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,805.47 : 257,445.15 = 71,911.28 : x
  2. Step 2: Convert to fraction form
    171,805.47/257,445.15 = 71,911.28/x
  3. Step 3: Cross multiply
    171,805.47x = 257,445.15 × 71,911.28
  4. Step 4: Simplify right side
    171,805.47x = 18,513,208,979.07
  5. Step 5: Solve for x
    x = 18,513,208,979.07/171,805.47
  6. Step 6: Final answer
    x = 107,756.81

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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.