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Finding the Fourth Proportional to 45,640, 68,471.52 and 12,808

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Solution

The fourth proportional to 45,640, 68,471.52 and 12,808 is: 19,215.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,640 : 68,471.52 = 12,808 : x
  2. Step 2: Convert to fraction form
    45,640/68,471.52 = 12,808/x
  3. Step 3: Cross multiply
    45,640x = 68,471.52 × 12,808
  4. Step 4: Simplify right side
    45,640x = 876,983,228.16
  5. Step 5: Solve for x
    x = 876,983,228.16/45,640
  6. Step 6: Final answer
    x = 19,215.23

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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.