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Finding the Fourth Proportional to 640,560.64, 960,855.36 and 219,840

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Solution

The fourth proportional to 640,560.64, 960,855.36 and 219,840 is: 329,764.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,560.64 : 960,855.36 = 219,840 : x
  2. Step 2: Convert to fraction form
    640,560.64/960,855.36 = 219,840/x
  3. Step 3: Cross multiply
    640,560.64x = 960,855.36 × 219,840
  4. Step 4: Simplify right side
    640,560.64x = 211,234,442,342.40
  5. Step 5: Solve for x
    x = 211,234,442,342.40/640,560.64
  6. Step 6: Final answer
    x = 329,764.94

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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.