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Finding the Fourth Proportional to 8,916.72, 12,302.10 and 5,138.88

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Solution

The fourth proportional to 8,916.72, 12,302.10 and 5,138.88 is: 7,089.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,916.72 : 12,302.10 = 5,138.88 : x
  2. Step 2: Convert to fraction form
    8,916.72/12,302.10 = 5,138.88/x
  3. Step 3: Cross multiply
    8,916.72x = 12,302.10 × 5,138.88
  4. Step 4: Simplify right side
    8,916.72x = 63,219,015.65
  5. Step 5: Solve for x
    x = 63,219,015.65/8,916.72
  6. Step 6: Final answer
    x = 7,089.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.