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Finding the Fourth Proportional to 128,261.16, 177,000.12 and 71,672.54

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Solution

The fourth proportional to 128,261.16, 177,000.12 and 71,672.54 is: 98,907.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,261.16 : 177,000.12 = 71,672.54 : x
  2. Step 2: Convert to fraction form
    128,261.16/177,000.12 = 71,672.54/x
  3. Step 3: Cross multiply
    128,261.16x = 177,000.12 × 71,672.54
  4. Step 4: Simplify right side
    128,261.16x = 12,686,047,295.70
  5. Step 5: Solve for x
    x = 12,686,047,295.70/128,261.16
  6. Step 6: Final answer
    x = 98,907.94

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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.