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Finding the Fourth Proportional to 64,680.24, 89,220.06 and 39,486

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Solution

The fourth proportional to 64,680.24, 89,220.06 and 39,486 is: 54,467.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,680.24 : 89,220.06 = 39,486 : x
  2. Step 2: Convert to fraction form
    64,680.24/89,220.06 = 39,486/x
  3. Step 3: Cross multiply
    64,680.24x = 89,220.06 × 39,486
  4. Step 4: Simplify right side
    64,680.24x = 3,522,943,289.16
  5. Step 5: Solve for x
    x = 3,522,943,289.16/64,680.24
  6. Step 6: Final answer
    x = 54,467.07

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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.