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Finding the Fourth Proportional to 1,145.70, 1,581.30 and 697.68

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Solution

The fourth proportional to 1,145.70, 1,581.30 and 697.68 is: 962.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.70 : 1,581.30 = 697.68 : x
  2. Step 2: Convert to fraction form
    1,145.70/1,581.30 = 697.68/x
  3. Step 3: Cross multiply
    1,145.70x = 1,581.30 × 697.68
  4. Step 4: Simplify right side
    1,145.70x = 1,103,241.38
  5. Step 5: Solve for x
    x = 1,103,241.38/1,145.70
  6. Step 6: Final answer
    x = 962.94

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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.