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Finding the Fourth Proportional to 65,390.45, 89,955.66 and 57,287.61

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Solution

The fourth proportional to 65,390.45, 89,955.66 and 57,287.61 is: 78,808.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,390.45 : 89,955.66 = 57,287.61 : x
  2. Step 2: Convert to fraction form
    65,390.45/89,955.66 = 57,287.61/x
  3. Step 3: Cross multiply
    65,390.45x = 89,955.66 × 57,287.61
  4. Step 4: Simplify right side
    65,390.45x = 5,153,344,767.37
  5. Step 5: Solve for x
    x = 5,153,344,767.37/65,390.45
  6. Step 6: Final answer
    x = 78,808.83

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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.