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Finding the Fourth Proportional to 64,612.72, 89,128.36 and 40,371.64

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Solution

The fourth proportional to 64,612.72, 89,128.36 and 40,371.64 is: 55,689.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,612.72 : 89,128.36 = 40,371.64 : x
  2. Step 2: Convert to fraction form
    64,612.72/89,128.36 = 40,371.64/x
  3. Step 3: Cross multiply
    64,612.72x = 89,128.36 × 40,371.64
  4. Step 4: Simplify right side
    64,612.72x = 3,598,258,063.71
  5. Step 5: Solve for x
    x = 3,598,258,063.71/64,612.72
  6. Step 6: Final answer
    x = 55,689.62

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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.