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Finding the Fourth Proportional to 89,020.80, 133,336.80 and 69,143.40

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Solution

The fourth proportional to 89,020.80, 133,336.80 and 69,143.40 is: 103,564.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,020.80 : 133,336.80 = 69,143.40 : x
  2. Step 2: Convert to fraction form
    89,020.80/133,336.80 = 69,143.40/x
  3. Step 3: Cross multiply
    89,020.80x = 133,336.80 × 69,143.40
  4. Step 4: Simplify right side
    89,020.80x = 9,219,359,697.12
  5. Step 5: Solve for x
    x = 9,219,359,697.12/89,020.80
  6. Step 6: Final answer
    x = 103,564.11

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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.