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Finding the Fourth Proportional to 8,640, 12,970.89 and 7,349.67

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Solution

The fourth proportional to 8,640, 12,970.89 and 7,349.67 is: 11,033.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,640 : 12,970.89 = 7,349.67 : x
  2. Step 2: Convert to fraction form
    8,640/12,970.89 = 7,349.67/x
  3. Step 3: Cross multiply
    8,640x = 12,970.89 × 7,349.67
  4. Step 4: Simplify right side
    8,640x = 95,331,761.11
  5. Step 5: Solve for x
    x = 95,331,761.11/8,640
  6. Step 6: Final answer
    x = 11,033.77

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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.