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Finding the Fourth Proportional to 128,763.28, 177,595.68 and 112,820

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Solution

The fourth proportional to 128,763.28, 177,595.68 and 112,820 is: 155,606.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,763.28 : 177,595.68 = 112,820 : x
  2. Step 2: Convert to fraction form
    128,763.28/177,595.68 = 112,820/x
  3. Step 3: Cross multiply
    128,763.28x = 177,595.68 × 112,820
  4. Step 4: Simplify right side
    128,763.28x = 20,036,344,617.60
  5. Step 5: Solve for x
    x = 20,036,344,617.60/128,763.28
  6. Step 6: Final answer
    x = 155,606.04

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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.