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Finding the Fourth Proportional to 100,806.51, 139,114.89 and 58,389.60

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Solution

The fourth proportional to 100,806.51, 139,114.89 and 58,389.60 is: 80,578.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,806.51 : 139,114.89 = 58,389.60 : x
  2. Step 2: Convert to fraction form
    100,806.51/139,114.89 = 58,389.60/x
  3. Step 3: Cross multiply
    100,806.51x = 139,114.89 × 58,389.60
  4. Step 4: Simplify right side
    100,806.51x = 8,122,862,781.14
  5. Step 5: Solve for x
    x = 8,122,862,781.14/100,806.51
  6. Step 6: Final answer
    x = 80,578.75

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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.