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Finding the Fourth Proportional to 100,943.70, 139,300.47 and 55,625.87

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Solution

The fourth proportional to 100,943.70, 139,300.47 and 55,625.87 is: 76,762.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,943.70 : 139,300.47 = 55,625.87 : x
  2. Step 2: Convert to fraction form
    100,943.70/139,300.47 = 55,625.87/x
  3. Step 3: Cross multiply
    100,943.70x = 139,300.47 × 55,625.87
  4. Step 4: Simplify right side
    100,943.70x = 7,748,709,138.66
  5. Step 5: Solve for x
    x = 7,748,709,138.66/100,943.70
  6. Step 6: Final answer
    x = 76,762.68

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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.