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Finding the Fourth Proportional to 268,858.63, 403,287.95 and 81,870.13

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Solution

The fourth proportional to 268,858.63, 403,287.95 and 81,870.13 is: 122,805.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,858.63 : 403,287.95 = 81,870.13 : x
  2. Step 2: Convert to fraction form
    268,858.63/403,287.95 = 81,870.13/x
  3. Step 3: Cross multiply
    268,858.63x = 403,287.95 × 81,870.13
  4. Step 4: Simplify right side
    268,858.63x = 33,017,236,893.93
  5. Step 5: Solve for x
    x = 33,017,236,893.93/268,858.63
  6. Step 6: Final answer
    x = 122,805.20

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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.