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Finding the Fourth Proportional to 89,219.60, 133,699.80 and 76,000.40

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Solution

The fourth proportional to 89,219.60, 133,699.80 and 76,000.40 is: 113,890.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,219.60 : 133,699.80 = 76,000.40 : x
  2. Step 2: Convert to fraction form
    89,219.60/133,699.80 = 76,000.40/x
  3. Step 3: Cross multiply
    89,219.60x = 133,699.80 × 76,000.40
  4. Step 4: Simplify right side
    89,219.60x = 10,161,238,279.92
  5. Step 5: Solve for x
    x = 10,161,238,279.92/89,219.60
  6. Step 6: Final answer
    x = 113,890.20

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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.