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Finding the Fourth Proportional to 1,286.65, 1,775.57 and 697.19

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Solution

The fourth proportional to 1,286.65, 1,775.57 and 697.19 is: 962.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.65 : 1,775.57 = 697.19 : x
  2. Step 2: Convert to fraction form
    1,286.65/1,775.57 = 697.19/x
  3. Step 3: Cross multiply
    1,286.65x = 1,775.57 × 697.19
  4. Step 4: Simplify right side
    1,286.65x = 1,237,909.65
  5. Step 5: Solve for x
    x = 1,237,909.65/1,286.65
  6. Step 6: Final answer
    x = 962.12

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Half scale
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Double scale
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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.