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Finding the Fourth Proportional to 219,311.70, 328,967.55 and 86,147.70

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Solution

The fourth proportional to 219,311.70, 328,967.55 and 86,147.70 is: 129,221.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,311.70 : 328,967.55 = 86,147.70 : x
  2. Step 2: Convert to fraction form
    219,311.70/328,967.55 = 86,147.70/x
  3. Step 3: Cross multiply
    219,311.70x = 328,967.55 × 86,147.70
  4. Step 4: Simplify right side
    219,311.70x = 28,339,797,807.14
  5. Step 5: Solve for x
    x = 28,339,797,807.14/219,311.70
  6. Step 6: Final answer
    x = 129,221.55

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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.