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Finding the Fourth Proportional to 128,674.20, 177,570.40 and 78,373.20

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Solution

The fourth proportional to 128,674.20, 177,570.40 and 78,373.20 is: 108,155.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,674.20 : 177,570.40 = 78,373.20 : x
  2. Step 2: Convert to fraction form
    128,674.20/177,570.40 = 78,373.20/x
  3. Step 3: Cross multiply
    128,674.20x = 177,570.40 × 78,373.20
  4. Step 4: Simplify right side
    128,674.20x = 13,916,760,473.28
  5. Step 5: Solve for x
    x = 13,916,760,473.28/128,674.20
  6. Step 6: Final answer
    x = 108,155.02

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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.