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Finding the Fourth Proportional to 128,911.88, 177,895.67 and 71,547.86

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Solution

The fourth proportional to 128,911.88, 177,895.67 and 71,547.86 is: 98,734.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,911.88 : 177,895.67 = 71,547.86 : x
  2. Step 2: Convert to fraction form
    128,911.88/177,895.67 = 71,547.86/x
  3. Step 3: Cross multiply
    128,911.88x = 177,895.67 × 71,547.86
  4. Step 4: Simplify right side
    128,911.88x = 12,728,053,244.55
  5. Step 5: Solve for x
    x = 12,728,053,244.55/128,911.88
  6. Step 6: Final answer
    x = 98,734.53

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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.