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Finding the Fourth Proportional to 128,547.80, 177,394.02 and 71,961.20

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Solution

The fourth proportional to 128,547.80, 177,394.02 and 71,961.20 is: 99,305.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,547.80 : 177,394.02 = 71,961.20 : x
  2. Step 2: Convert to fraction form
    128,547.80/177,394.02 = 71,961.20/x
  3. Step 3: Cross multiply
    128,547.80x = 177,394.02 × 71,961.20
  4. Step 4: Simplify right side
    128,547.80x = 12,765,486,552.02
  5. Step 5: Solve for x
    x = 12,765,486,552.02/128,547.80
  6. Step 6: Final answer
    x = 99,305.37

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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.