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Finding the Fourth Proportional to 139,881.75, 209,855.40 and 55,646.71

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Solution

The fourth proportional to 139,881.75, 209,855.40 and 55,646.71 is: 83,483.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,881.75 : 209,855.40 = 55,646.71 : x
  2. Step 2: Convert to fraction form
    139,881.75/209,855.40 = 55,646.71/x
  3. Step 3: Cross multiply
    139,881.75x = 209,855.40 × 55,646.71
  4. Step 4: Simplify right side
    139,881.75x = 11,677,761,536.46
  5. Step 5: Solve for x
    x = 11,677,761,536.46/139,881.75
  6. Step 6: Final answer
    x = 83,483.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.