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Finding the Fourth Proportional to 91,985.70, 137,978.55 and 76,433.70

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Solution

The fourth proportional to 91,985.70, 137,978.55 and 76,433.70 is: 114,650.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,985.70 : 137,978.55 = 76,433.70 : x
  2. Step 2: Convert to fraction form
    91,985.70/137,978.55 = 76,433.70/x
  3. Step 3: Cross multiply
    91,985.70x = 137,978.55 × 76,433.70
  4. Step 4: Simplify right side
    91,985.70x = 10,546,211,097.14
  5. Step 5: Solve for x
    x = 10,546,211,097.14/91,985.70
  6. Step 6: Final answer
    x = 114,650.55

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1.5x scale

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.