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Finding the Fourth Proportional to 1,162.84, 1,605.20 and 697

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Solution

The fourth proportional to 1,162.84, 1,605.20 and 697 is: 962.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,162.84 : 1,605.20 = 697 : x
  2. Step 2: Convert to fraction form
    1,162.84/1,605.20 = 697/x
  3. Step 3: Cross multiply
    1,162.84x = 1,605.20 × 697
  4. Step 4: Simplify right side
    1,162.84x = 1,118,824.40
  5. Step 5: Solve for x
    x = 1,118,824.40/1,162.84
  6. Step 6: Final answer
    x = 962.15

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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.