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Finding the Fourth Proportional to 1,084.70, 1,497.08 and 642.82

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Solution

The fourth proportional to 1,084.70, 1,497.08 and 642.82 is: 887.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,084.70 : 1,497.08 = 642.82 : x
  2. Step 2: Convert to fraction form
    1,084.70/1,497.08 = 642.82/x
  3. Step 3: Cross multiply
    1,084.70x = 1,497.08 × 642.82
  4. Step 4: Simplify right side
    1,084.70x = 962,352.97
  5. Step 5: Solve for x
    x = 962,352.97/1,084.70
  6. Step 6: Final answer
    x = 887.21

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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.