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Finding the Fourth Proportional to 100,980.52, 139,352.40 and 55,658.50

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Solution

The fourth proportional to 100,980.52, 139,352.40 and 55,658.50 is: 76,808.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,980.52 : 139,352.40 = 55,658.50 : x
  2. Step 2: Convert to fraction form
    100,980.52/139,352.40 = 55,658.50/x
  3. Step 3: Cross multiply
    100,980.52x = 139,352.40 × 55,658.50
  4. Step 4: Simplify right side
    100,980.52x = 7,756,145,555.40
  5. Step 5: Solve for x
    x = 7,756,145,555.40/100,980.52
  6. Step 6: Final answer
    x = 76,808.33

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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.