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Finding the Fourth Proportional to 105,619.71, 145,755.21 and 63,188.25

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Solution

The fourth proportional to 105,619.71, 145,755.21 and 63,188.25 is: 87,199.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,619.71 : 145,755.21 = 63,188.25 : x
  2. Step 2: Convert to fraction form
    105,619.71/145,755.21 = 63,188.25/x
  3. Step 3: Cross multiply
    105,619.71x = 145,755.21 × 63,188.25
  4. Step 4: Simplify right side
    105,619.71x = 9,210,016,648.28
  5. Step 5: Solve for x
    x = 9,210,016,648.28/105,619.71
  6. Step 6: Final answer
    x = 87,199.79

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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.