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Finding the Fourth Proportional to 128,655.39, 192,904.94 and 57,564.78

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Solution

The fourth proportional to 128,655.39, 192,904.94 and 57,564.78 is: 86,312.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,655.39 : 192,904.94 = 57,564.78 : x
  2. Step 2: Convert to fraction form
    128,655.39/192,904.94 = 57,564.78/x
  3. Step 3: Cross multiply
    128,655.39x = 192,904.94 × 57,564.78
  4. Step 4: Simplify right side
    128,655.39x = 11,104,530,432.01
  5. Step 5: Solve for x
    x = 11,104,530,432.01/128,655.39
  6. Step 6: Final answer
    x = 86,312.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.