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Finding the Fourth Proportional to 213,072.80, 319,387.80 and 86,658.80

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Solution

The fourth proportional to 213,072.80, 319,387.80 and 86,658.80 is: 129,898.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,072.80 : 319,387.80 = 86,658.80 : x
  2. Step 2: Convert to fraction form
    213,072.80/319,387.80 = 86,658.80/x
  3. Step 3: Cross multiply
    213,072.80x = 319,387.80 × 86,658.80
  4. Step 4: Simplify right side
    213,072.80x = 27,677,763,482.64
  5. Step 5: Solve for x
    x = 27,677,763,482.64/213,072.80
  6. Step 6: Final answer
    x = 129,898.15

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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.