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Finding the Fourth Proportional to 219,078.66, 328,491.20 and 85,802.88

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Solution

The fourth proportional to 219,078.66, 328,491.20 and 85,802.88 is: 128,654.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,078.66 : 328,491.20 = 85,802.88 : x
  2. Step 2: Convert to fraction form
    219,078.66/328,491.20 = 85,802.88/x
  3. Step 3: Cross multiply
    219,078.66x = 328,491.20 × 85,802.88
  4. Step 4: Simplify right side
    219,078.66x = 28,185,491,014.66
  5. Step 5: Solve for x
    x = 28,185,491,014.66/219,078.66
  6. Step 6: Final answer
    x = 128,654.66

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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.