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Finding the Fourth Proportional to 8,916.88, 13,385.60 and 5,221.76

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Solution

The fourth proportional to 8,916.88, 13,385.60 and 5,221.76 is: 7,838.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,916.88 : 13,385.60 = 5,221.76 : x
  2. Step 2: Convert to fraction form
    8,916.88/13,385.60 = 5,221.76/x
  3. Step 3: Cross multiply
    8,916.88x = 13,385.60 × 5,221.76
  4. Step 4: Simplify right side
    8,916.88x = 69,896,390.66
  5. Step 5: Solve for x
    x = 69,896,390.66/8,916.88
  6. Step 6: Final answer
    x = 7,838.66

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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.