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Finding the Fourth Proportional to 231,801.95, 319,871.30 and 128,429.30

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Solution

The fourth proportional to 231,801.95, 319,871.30 and 128,429.30 is: 177,223.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,801.95 : 319,871.30 = 128,429.30 : x
  2. Step 2: Convert to fraction form
    231,801.95/319,871.30 = 128,429.30/x
  3. Step 3: Cross multiply
    231,801.95x = 319,871.30 × 128,429.30
  4. Step 4: Simplify right side
    231,801.95x = 41,080,846,590.97
  5. Step 5: Solve for x
    x = 41,080,846,590.97/231,801.95
  6. Step 6: Final answer
    x = 177,223.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.