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Finding the Fourth Proportional to 91,811.80, 137,609.70 and 52,406.20

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Solution

The fourth proportional to 91,811.80, 137,609.70 and 52,406.20 is: 78,547.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,811.80 : 137,609.70 = 52,406.20 : x
  2. Step 2: Convert to fraction form
    91,811.80/137,609.70 = 52,406.20/x
  3. Step 3: Cross multiply
    91,811.80x = 137,609.70 × 52,406.20
  4. Step 4: Simplify right side
    91,811.80x = 7,211,601,460.14
  5. Step 5: Solve for x
    x = 7,211,601,460.14/91,811.80
  6. Step 6: Final answer
    x = 78,547.65

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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.