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Finding the Fourth Proportional to 64,530, 89,012.79 and 40,615.16

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Solution

The fourth proportional to 64,530, 89,012.79 and 40,615.16 is: 56,024.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,530 : 89,012.79 = 40,615.16 : x
  2. Step 2: Convert to fraction form
    64,530/89,012.79 = 40,615.16/x
  3. Step 3: Cross multiply
    64,530x = 89,012.79 × 40,615.16
  4. Step 4: Simplify right side
    64,530x = 3,615,268,262.83
  5. Step 5: Solve for x
    x = 3,615,268,262.83/64,530
  6. Step 6: Final answer
    x = 56,024.61

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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.