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Finding the Fourth Proportional to 128,503.94, 177,348.69 and 74,058.02

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Solution

The fourth proportional to 128,503.94, 177,348.69 and 74,058.02 is: 102,207.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,503.94 : 177,348.69 = 74,058.02 : x
  2. Step 2: Convert to fraction form
    128,503.94/177,348.69 = 74,058.02/x
  3. Step 3: Cross multiply
    128,503.94x = 177,348.69 × 74,058.02
  4. Step 4: Simplify right side
    128,503.94x = 13,134,092,830.99
  5. Step 5: Solve for x
    x = 13,134,092,830.99/128,503.94
  6. Step 6: Final answer
    x = 102,207.71

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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.