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Finding the Fourth Proportional to 128,632.61, 192,845.87 and 61,130.76

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Solution

The fourth proportional to 128,632.61, 192,845.87 and 61,130.76 is: 91,647.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,632.61 : 192,845.87 = 61,130.76 : x
  2. Step 2: Convert to fraction form
    128,632.61/192,845.87 = 61,130.76/x
  3. Step 3: Cross multiply
    128,632.61x = 192,845.87 × 61,130.76
  4. Step 4: Simplify right side
    128,632.61x = 11,788,814,290.31
  5. Step 5: Solve for x
    x = 11,788,814,290.31/128,632.61
  6. Step 6: Final answer
    x = 91,647.17

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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.