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Finding the Fourth Proportional to 710.84, 1,063.96 and 643.48

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Solution

The fourth proportional to 710.84, 1,063.96 and 643.48 is: 963.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.84 : 1,063.96 = 643.48 : x
  2. Step 2: Convert to fraction form
    710.84/1,063.96 = 643.48/x
  3. Step 3: Cross multiply
    710.84x = 1,063.96 × 643.48
  4. Step 4: Simplify right side
    710.84x = 684,636.98
  5. Step 5: Solve for x
    x = 684,636.98/710.84
  6. Step 6: Final answer
    x = 963.14

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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.