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Finding the Fourth Proportional to 158,668.56, 218,981.99 and 90,688.40

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Solution

The fourth proportional to 158,668.56, 218,981.99 and 90,688.40 is: 125,161.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,668.56 : 218,981.99 = 90,688.40 : x
  2. Step 2: Convert to fraction form
    158,668.56/218,981.99 = 90,688.40/x
  3. Step 3: Cross multiply
    158,668.56x = 218,981.99 × 90,688.40
  4. Step 4: Simplify right side
    158,668.56x = 19,859,126,301.92
  5. Step 5: Solve for x
    x = 19,859,126,301.92/158,668.56
  6. Step 6: Final answer
    x = 125,161.07

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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.