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Finding the Fourth Proportional to 91,325.10, 136,987.65 and 76,890.90

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Solution

The fourth proportional to 91,325.10, 136,987.65 and 76,890.90 is: 115,336.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,325.10 : 136,987.65 = 76,890.90 : x
  2. Step 2: Convert to fraction form
    91,325.10/136,987.65 = 76,890.90/x
  3. Step 3: Cross multiply
    91,325.10x = 136,987.65 × 76,890.90
  4. Step 4: Simplify right side
    91,325.10x = 10,533,103,697.39
  5. Step 5: Solve for x
    x = 10,533,103,697.39/91,325.10
  6. Step 6: Final answer
    x = 115,336.35

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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.