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Finding the Fourth Proportional to 128,234.88, 176,938.56 and 74,520

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Solution

The fourth proportional to 128,234.88, 176,938.56 and 74,520 is: 102,822.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,234.88 : 176,938.56 = 74,520 : x
  2. Step 2: Convert to fraction form
    128,234.88/176,938.56 = 74,520/x
  3. Step 3: Cross multiply
    128,234.88x = 176,938.56 × 74,520
  4. Step 4: Simplify right side
    128,234.88x = 13,185,461,491.20
  5. Step 5: Solve for x
    x = 13,185,461,491.20/128,234.88
  6. Step 6: Final answer
    x = 102,822.74

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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.