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Finding the Fourth Proportional to 98,930.61, 136,489.55 and 55,904.49

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Solution

The fourth proportional to 98,930.61, 136,489.55 and 55,904.49 is: 77,128.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,930.61 : 136,489.55 = 55,904.49 : x
  2. Step 2: Convert to fraction form
    98,930.61/136,489.55 = 55,904.49/x
  3. Step 3: Cross multiply
    98,930.61x = 136,489.55 × 55,904.49
  4. Step 4: Simplify right side
    98,930.61x = 7,630,378,403.56
  5. Step 5: Solve for x
    x = 7,630,378,403.56/98,930.61
  6. Step 6: Final answer
    x = 77,128.59

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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.