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Finding the Fourth Proportional to 78,987.15, 118,477.08 and 19,821.51

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Solution

The fourth proportional to 78,987.15, 118,477.08 and 19,821.51 is: 29,731.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,987.15 : 118,477.08 = 19,821.51 : x
  2. Step 2: Convert to fraction form
    78,987.15/118,477.08 = 19,821.51/x
  3. Step 3: Cross multiply
    78,987.15x = 118,477.08 × 19,821.51
  4. Step 4: Simplify right side
    78,987.15x = 2,348,394,625.99
  5. Step 5: Solve for x
    x = 2,348,394,625.99/78,987.15
  6. Step 6: Final answer
    x = 29,731.35

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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.