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Finding the Fourth Proportional to 1,217.79, 1,680.33 and 693.72

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Solution

The fourth proportional to 1,217.79, 1,680.33 and 693.72 is: 957.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.79 : 1,680.33 = 693.72 : x
  2. Step 2: Convert to fraction form
    1,217.79/1,680.33 = 693.72/x
  3. Step 3: Cross multiply
    1,217.79x = 1,680.33 × 693.72
  4. Step 4: Simplify right side
    1,217.79x = 1,165,678.53
  5. Step 5: Solve for x
    x = 1,165,678.53/1,217.79
  6. Step 6: Final answer
    x = 957.21

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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.