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Finding the Fourth Proportional to 171,208.80, 256,813.20 and 121,345.20

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Solution

The fourth proportional to 171,208.80, 256,813.20 and 121,345.20 is: 182,017.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,208.80 : 256,813.20 = 121,345.20 : x
  2. Step 2: Convert to fraction form
    171,208.80/256,813.20 = 121,345.20/x
  3. Step 3: Cross multiply
    171,208.80x = 256,813.20 × 121,345.20
  4. Step 4: Simplify right side
    171,208.80x = 31,163,049,116.64
  5. Step 5: Solve for x
    x = 31,163,049,116.64/171,208.80
  6. Step 6: Final answer
    x = 182,017.80

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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.