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Finding the Fourth Proportional to 100,726.51, 138,992.93 and 55,403.77

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Solution

The fourth proportional to 100,726.51, 138,992.93 and 55,403.77 is: 76,451.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,726.51 : 138,992.93 = 55,403.77 : x
  2. Step 2: Convert to fraction form
    100,726.51/138,992.93 = 55,403.77/x
  3. Step 3: Cross multiply
    100,726.51x = 138,992.93 × 55,403.77
  4. Step 4: Simplify right side
    100,726.51x = 7,700,732,325.35
  5. Step 5: Solve for x
    x = 7,700,732,325.35/100,726.51
  6. Step 6: Final answer
    x = 76,451.89

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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.