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Finding the Fourth Proportional to 128,754.54, 177,686.93 and 71,390.21

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Solution

The fourth proportional to 128,754.54, 177,686.93 and 71,390.21 is: 98,521.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,754.54 : 177,686.93 = 71,390.21 : x
  2. Step 2: Convert to fraction form
    128,754.54/177,686.93 = 71,390.21/x
  3. Step 3: Cross multiply
    128,754.54x = 177,686.93 × 71,390.21
  4. Step 4: Simplify right side
    128,754.54x = 12,685,106,537.00
  5. Step 5: Solve for x
    x = 12,685,106,537.00/128,754.54
  6. Step 6: Final answer
    x = 98,521.63

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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.