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Finding the Fourth Proportional to 100,987.96, 139,363.54 and 58,571.16

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Solution

The fourth proportional to 100,987.96, 139,363.54 and 58,571.16 is: 80,828.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,987.96 : 139,363.54 = 58,571.16 : x
  2. Step 2: Convert to fraction form
    100,987.96/139,363.54 = 58,571.16/x
  3. Step 3: Cross multiply
    100,987.96x = 139,363.54 × 58,571.16
  4. Step 4: Simplify right side
    100,987.96x = 8,162,684,199.51
  5. Step 5: Solve for x
    x = 8,162,684,199.51/100,987.96
  6. Step 6: Final answer
    x = 80,828.29

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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.