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Finding the Fourth Proportional to 91,609.86, 137,211.78 and 70,393.74

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Solution

The fourth proportional to 91,609.86, 137,211.78 and 70,393.74 is: 105,434.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,609.86 : 137,211.78 = 70,393.74 : x
  2. Step 2: Convert to fraction form
    91,609.86/137,211.78 = 70,393.74/x
  3. Step 3: Cross multiply
    91,609.86x = 137,211.78 × 70,393.74
  4. Step 4: Simplify right side
    91,609.86x = 9,658,850,366.26
  5. Step 5: Solve for x
    x = 9,658,850,366.26/91,609.86
  6. Step 6: Final answer
    x = 105,434.62

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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.