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Finding the Fourth Proportional to 1,217.72, 1,680.36 and 693.80

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Solution

The fourth proportional to 1,217.72, 1,680.36 and 693.80 is: 957.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.72 : 1,680.36 = 693.80 : x
  2. Step 2: Convert to fraction form
    1,217.72/1,680.36 = 693.80/x
  3. Step 3: Cross multiply
    1,217.72x = 1,680.36 × 693.80
  4. Step 4: Simplify right side
    1,217.72x = 1,165,833.77
  5. Step 5: Solve for x
    x = 1,165,833.77/1,217.72
  6. Step 6: Final answer
    x = 957.39

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1.5x scale

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.