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Finding the Fourth Proportional to 138,572.51, 191,282.06 and 90,828.93

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Solution

The fourth proportional to 138,572.51, 191,282.06 and 90,828.93 is: 125,378.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,572.51 : 191,282.06 = 90,828.93 : x
  2. Step 2: Convert to fraction form
    138,572.51/191,282.06 = 90,828.93/x
  3. Step 3: Cross multiply
    138,572.51x = 191,282.06 × 90,828.93
  4. Step 4: Simplify right side
    138,572.51x = 17,373,944,383.85
  5. Step 5: Solve for x
    x = 17,373,944,383.85/138,572.51
  6. Step 6: Final answer
    x = 125,378.01

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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.