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Finding the Fourth Proportional to 128,569.90, 177,437.44 and 74,871.76

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Solution

The fourth proportional to 128,569.90, 177,437.44 and 74,871.76 is: 103,329.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,569.90 : 177,437.44 = 74,871.76 : x
  2. Step 2: Convert to fraction form
    128,569.90/177,437.44 = 74,871.76/x
  3. Step 3: Cross multiply
    128,569.90x = 177,437.44 × 74,871.76
  4. Step 4: Simplify right side
    128,569.90x = 13,285,053,422.69
  5. Step 5: Solve for x
    x = 13,285,053,422.69/128,569.90
  6. Step 6: Final answer
    x = 103,329.42

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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.