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Finding the Fourth Proportional to 90,611.39, 124,898.31 and 61,530.64

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Solution

The fourth proportional to 90,611.39, 124,898.31 and 61,530.64 is: 84,813.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,611.39 : 124,898.31 = 61,530.64 : x
  2. Step 2: Convert to fraction form
    90,611.39/124,898.31 = 61,530.64/x
  3. Step 3: Cross multiply
    90,611.39x = 124,898.31 × 61,530.64
  4. Step 4: Simplify right side
    90,611.39x = 7,685,072,636.97
  5. Step 5: Solve for x
    x = 7,685,072,636.97/90,611.39
  6. Step 6: Final answer
    x = 84,813.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.