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Finding the Fourth Proportional to 138,005.61, 190,448.81 and 76,752.66

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Solution

The fourth proportional to 138,005.61, 190,448.81 and 76,752.66 is: 105,919.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,005.61 : 190,448.81 = 76,752.66 : x
  2. Step 2: Convert to fraction form
    138,005.61/190,448.81 = 76,752.66/x
  3. Step 3: Cross multiply
    138,005.61x = 190,448.81 × 76,752.66
  4. Step 4: Simplify right side
    138,005.61x = 14,617,452,761.33
  5. Step 5: Solve for x
    x = 14,617,452,761.33/138,005.61
  6. Step 6: Final answer
    x = 105,919.26

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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.