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Finding the Fourth Proportional to 64,728.40, 89,321.84 and 36,435.90

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Solution

The fourth proportional to 64,728.40, 89,321.84 and 36,435.90 is: 50,279.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,728.40 : 89,321.84 = 36,435.90 : x
  2. Step 2: Convert to fraction form
    64,728.40/89,321.84 = 36,435.90/x
  3. Step 3: Cross multiply
    64,728.40x = 89,321.84 × 36,435.90
  4. Step 4: Simplify right side
    64,728.40x = 3,254,521,630.06
  5. Step 5: Solve for x
    x = 3,254,521,630.06/64,728.40
  6. Step 6: Final answer
    x = 50,279.66

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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.