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Finding the Fourth Proportional to 128,422.94, 177,223.87 and 71,064.68

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Solution

The fourth proportional to 128,422.94, 177,223.87 and 71,064.68 is: 98,069.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,422.94 : 177,223.87 = 71,064.68 : x
  2. Step 2: Convert to fraction form
    128,422.94/177,223.87 = 71,064.68/x
  3. Step 3: Cross multiply
    128,422.94x = 177,223.87 × 71,064.68
  4. Step 4: Simplify right side
    128,422.94x = 12,594,357,760.16
  5. Step 5: Solve for x
    x = 12,594,357,760.16/128,422.94
  6. Step 6: Final answer
    x = 98,069.37

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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.