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Finding the Fourth Proportional to 145,040.94, 217,647.54 and 78,479.61

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Solution

The fourth proportional to 145,040.94, 217,647.54 and 78,479.61 is: 117,766.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,040.94 : 217,647.54 = 78,479.61 : x
  2. Step 2: Convert to fraction form
    145,040.94/217,647.54 = 78,479.61/x
  3. Step 3: Cross multiply
    145,040.94x = 217,647.54 × 78,479.61
  4. Step 4: Simplify right side
    145,040.94x = 17,080,894,056.66
  5. Step 5: Solve for x
    x = 17,080,894,056.66/145,040.94
  6. Step 6: Final answer
    x = 117,766.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.