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Finding the Fourth Proportional to 64,686.60, 89,261.16 and 36,391.68

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Solution

The fourth proportional to 64,686.60, 89,261.16 and 36,391.68 is: 50,216.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,686.60 : 89,261.16 = 36,391.68 : x
  2. Step 2: Convert to fraction form
    64,686.60/89,261.16 = 36,391.68/x
  3. Step 3: Cross multiply
    64,686.60x = 89,261.16 × 36,391.68
  4. Step 4: Simplify right side
    64,686.60x = 3,248,363,571.15
  5. Step 5: Solve for x
    x = 3,248,363,571.15/64,686.60
  6. Step 6: Final answer
    x = 50,216.95

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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.