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Finding the Fourth Proportional to 1,214.50, 1,675.80 and 717.10

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Solution

The fourth proportional to 1,214.50, 1,675.80 and 717.10 is: 989.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.50 : 1,675.80 = 717.10 : x
  2. Step 2: Convert to fraction form
    1,214.50/1,675.80 = 717.10/x
  3. Step 3: Cross multiply
    1,214.50x = 1,675.80 × 717.10
  4. Step 4: Simplify right side
    1,214.50x = 1,201,716.18
  5. Step 5: Solve for x
    x = 1,201,716.18/1,214.50
  6. Step 6: Final answer
    x = 989.47

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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.