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Finding the Fourth Proportional to 128,020.52, 176,699.94 and 77,761.64

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Solution

The fourth proportional to 128,020.52, 176,699.94 and 77,761.64 is: 107,330.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,020.52 : 176,699.94 = 77,761.64 : x
  2. Step 2: Convert to fraction form
    128,020.52/176,699.94 = 77,761.64/x
  3. Step 3: Cross multiply
    128,020.52x = 176,699.94 × 77,761.64
  4. Step 4: Simplify right side
    128,020.52x = 13,740,477,122.30
  5. Step 5: Solve for x
    x = 13,740,477,122.30/128,020.52
  6. Step 6: Final answer
    x = 107,330.27

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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.