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Finding the Fourth Proportional to 642,963.90, 887,344.50 and 356,576.25

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Solution

The fourth proportional to 642,963.90, 887,344.50 and 356,576.25 is: 492,105.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,963.90 : 887,344.50 = 356,576.25 : x
  2. Step 2: Convert to fraction form
    642,963.90/887,344.50 = 356,576.25/x
  3. Step 3: Cross multiply
    642,963.90x = 887,344.50 × 356,576.25
  4. Step 4: Simplify right side
    642,963.90x = 316,405,974,268.13
  5. Step 5: Solve for x
    x = 316,405,974,268.13/642,963.90
  6. Step 6: Final answer
    x = 492,105.35

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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.