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Finding the Fourth Proportional to 712.65, 983.44 and 402.15

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Solution

The fourth proportional to 712.65, 983.44 and 402.15 is: 554.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.65 : 983.44 = 402.15 : x
  2. Step 2: Convert to fraction form
    712.65/983.44 = 402.15/x
  3. Step 3: Cross multiply
    712.65x = 983.44 × 402.15
  4. Step 4: Simplify right side
    712.65x = 395,490.40
  5. Step 5: Solve for x
    x = 395,490.40/712.65
  6. Step 6: Final answer
    x = 554.96

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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.