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Finding the Fourth Proportional to 158,407.72, 218,608.68 and 90,435.76

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Solution

The fourth proportional to 158,407.72, 218,608.68 and 90,435.76 is: 124,804.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,407.72 : 218,608.68 = 90,435.76 : x
  2. Step 2: Convert to fraction form
    158,407.72/218,608.68 = 90,435.76/x
  3. Step 3: Cross multiply
    158,407.72x = 218,608.68 × 90,435.76
  4. Step 4: Simplify right side
    158,407.72x = 19,770,042,118.40
  5. Step 5: Solve for x
    x = 19,770,042,118.40/158,407.72
  6. Step 6: Final answer
    x = 124,804.79

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1.5x scale

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.