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Finding the Fourth Proportional to 219,038.88, 328,558.32 and 85,981.80

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Solution

The fourth proportional to 219,038.88, 328,558.32 and 85,981.80 is: 128,972.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,038.88 : 328,558.32 = 85,981.80 : x
  2. Step 2: Convert to fraction form
    219,038.88/328,558.32 = 85,981.80/x
  3. Step 3: Cross multiply
    219,038.88x = 328,558.32 × 85,981.80
  4. Step 4: Simplify right side
    219,038.88x = 28,250,035,758.58
  5. Step 5: Solve for x
    x = 28,250,035,758.58/219,038.88
  6. Step 6: Final answer
    x = 128,972.70

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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.