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Finding the Fourth Proportional to 205,991.10, 308,986.65 and 87,666.30

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Solution

The fourth proportional to 205,991.10, 308,986.65 and 87,666.30 is: 131,499.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,991.10 : 308,986.65 = 87,666.30 : x
  2. Step 2: Convert to fraction form
    205,991.10/308,986.65 = 87,666.30/x
  3. Step 3: Cross multiply
    205,991.10x = 308,986.65 × 87,666.30
  4. Step 4: Simplify right side
    205,991.10x = 27,087,716,354.90
  5. Step 5: Solve for x
    x = 27,087,716,354.90/205,991.10
  6. Step 6: Final answer
    x = 131,499.45

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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.