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Finding the Fourth Proportional to 128,073.90, 191,955.24 and 90,644.88

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Solution

The fourth proportional to 128,073.90, 191,955.24 and 90,644.88 is: 135,857.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,073.90 : 191,955.24 = 90,644.88 : x
  2. Step 2: Convert to fraction form
    128,073.90/191,955.24 = 90,644.88/x
  3. Step 3: Cross multiply
    128,073.90x = 191,955.24 × 90,644.88
  4. Step 4: Simplify right side
    128,073.90x = 17,399,759,695.17
  5. Step 5: Solve for x
    x = 17,399,759,695.17/128,073.90
  6. Step 6: Final answer
    x = 135,857.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.