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Finding the Fourth Proportional to 128,709.98, 177,422.88 and 90,361.95

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Solution

The fourth proportional to 128,709.98, 177,422.88 and 90,361.95 is: 124,561.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,709.98 : 177,422.88 = 90,361.95 : x
  2. Step 2: Convert to fraction form
    128,709.98/177,422.88 = 90,361.95/x
  3. Step 3: Cross multiply
    128,709.98x = 177,422.88 × 90,361.95
  4. Step 4: Simplify right side
    128,709.98x = 16,032,277,411.42
  5. Step 5: Solve for x
    x = 16,032,277,411.42/128,709.98
  6. Step 6: Final answer
    x = 124,561.26

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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.