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Finding the Fourth Proportional to 128,726.64, 193,130.28 and 57,708.81

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Solution

The fourth proportional to 128,726.64, 193,130.28 and 57,708.81 is: 86,581.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,726.64 : 193,130.28 = 57,708.81 : x
  2. Step 2: Convert to fraction form
    128,726.64/193,130.28 = 57,708.81/x
  3. Step 3: Cross multiply
    128,726.64x = 193,130.28 × 57,708.81
  4. Step 4: Simplify right side
    128,726.64x = 11,145,318,633.77
  5. Step 5: Solve for x
    x = 11,145,318,633.77/128,726.64
  6. Step 6: Final answer
    x = 86,581.29

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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.