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Finding the Fourth Proportional to 171,420.80, 257,131.20 and 71,547.80

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Solution

The fourth proportional to 171,420.80, 257,131.20 and 71,547.80 is: 107,321.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,420.80 : 257,131.20 = 71,547.80 : x
  2. Step 2: Convert to fraction form
    171,420.80/257,131.20 = 71,547.80/x
  3. Step 3: Cross multiply
    171,420.80x = 257,131.20 × 71,547.80
  4. Step 4: Simplify right side
    171,420.80x = 18,397,171,671.36
  5. Step 5: Solve for x
    x = 18,397,171,671.36/171,420.80
  6. Step 6: Final answer
    x = 107,321.70

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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.