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Finding the Fourth Proportional to 231,006.90, 318,786.12 and 129,033.78

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Solution

The fourth proportional to 231,006.90, 318,786.12 and 129,033.78 is: 178,064.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,006.90 : 318,786.12 = 129,033.78 : x
  2. Step 2: Convert to fraction form
    231,006.90/318,786.12 = 129,033.78/x
  3. Step 3: Cross multiply
    231,006.90x = 318,786.12 × 129,033.78
  4. Step 4: Simplify right side
    231,006.90x = 41,134,178,075.13
  5. Step 5: Solve for x
    x = 41,134,178,075.13/231,006.90
  6. Step 6: Final answer
    x = 178,064.72

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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.