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Finding the Fourth Proportional to 642,999.47, 887,326.04 and 356,517.05

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Solution

The fourth proportional to 642,999.47, 887,326.04 and 356,517.05 is: 491,986.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,999.47 : 887,326.04 = 356,517.05 : x
  2. Step 2: Convert to fraction form
    642,999.47/887,326.04 = 356,517.05/x
  3. Step 3: Cross multiply
    642,999.47x = 887,326.04 × 356,517.05
  4. Step 4: Simplify right side
    642,999.47x = 316,346,858,623.64
  5. Step 5: Solve for x
    x = 316,346,858,623.64/642,999.47
  6. Step 6: Final answer
    x = 491,986.19

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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.