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Finding the Fourth Proportional to 940.30, 1,297.58 and 645.56

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Solution

The fourth proportional to 940.30, 1,297.58 and 645.56 is: 890.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.30 : 1,297.58 = 645.56 : x
  2. Step 2: Convert to fraction form
    940.30/1,297.58 = 645.56/x
  3. Step 3: Cross multiply
    940.30x = 1,297.58 × 645.56
  4. Step 4: Simplify right side
    940.30x = 837,665.74
  5. Step 5: Solve for x
    x = 837,665.74/940.30
  6. Step 6: Final answer
    x = 890.85

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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.