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Finding the Fourth Proportional to 128,710.98, 177,424.26 and 90,362.95

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Solution

The fourth proportional to 128,710.98, 177,424.26 and 90,362.95 is: 124,562.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,710.98 : 177,424.26 = 90,362.95 : x
  2. Step 2: Convert to fraction form
    128,710.98/177,424.26 = 90,362.95/x
  3. Step 3: Cross multiply
    128,710.98x = 177,424.26 × 90,362.95
  4. Step 4: Simplify right side
    128,710.98x = 16,032,579,535.17
  5. Step 5: Solve for x
    x = 16,032,579,535.17/128,710.98
  6. Step 6: Final answer
    x = 124,562.64

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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.