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Finding the Fourth Proportional to 78,980.82, 118,477.35 and 26,390.49

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Solution

The fourth proportional to 78,980.82, 118,477.35 and 26,390.49 is: 39,587.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,980.82 : 118,477.35 = 26,390.49 : x
  2. Step 2: Convert to fraction form
    78,980.82/118,477.35 = 26,390.49/x
  3. Step 3: Cross multiply
    78,980.82x = 118,477.35 × 26,390.49
  4. Step 4: Simplify right side
    78,980.82x = 3,126,675,320.40
  5. Step 5: Solve for x
    x = 3,126,675,320.40/78,980.82
  6. Step 6: Final answer
    x = 39,587.78

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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.