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Finding the Fourth Proportional to 128,285.55, 177,034.32 and 71,696.91

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Solution

The fourth proportional to 128,285.55, 177,034.32 and 71,696.91 is: 98,941.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,285.55 : 177,034.32 = 71,696.91 : x
  2. Step 2: Convert to fraction form
    128,285.55/177,034.32 = 71,696.91/x
  3. Step 3: Cross multiply
    128,285.55x = 177,034.32 × 71,696.91
  4. Step 4: Simplify right side
    128,285.55x = 12,692,813,707.95
  5. Step 5: Solve for x
    x = 12,692,813,707.95/128,285.55
  6. Step 6: Final answer
    x = 98,941.88

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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.