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Finding the Fourth Proportional to 213,175.88, 319,646.30 and 86,783.76

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Solution

The fourth proportional to 213,175.88, 319,646.30 and 86,783.76 is: 130,127.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,175.88 : 319,646.30 = 86,783.76 : x
  2. Step 2: Convert to fraction form
    213,175.88/319,646.30 = 86,783.76/x
  3. Step 3: Cross multiply
    213,175.88x = 319,646.30 × 86,783.76
  4. Step 4: Simplify right side
    213,175.88x = 27,740,107,784.09
  5. Step 5: Solve for x
    x = 27,740,107,784.09/213,175.88
  6. Step 6: Final answer
    x = 130,127.80

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1.5x scale

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.