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Finding the Fourth Proportional to 919.41, 1,267.52 and 890.69

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Solution

The fourth proportional to 919.41, 1,267.52 and 890.69 is: 1,227.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.41 : 1,267.52 = 890.69 : x
  2. Step 2: Convert to fraction form
    919.41/1,267.52 = 890.69/x
  3. Step 3: Cross multiply
    919.41x = 1,267.52 × 890.69
  4. Step 4: Simplify right side
    919.41x = 1,128,967.39
  5. Step 5: Solve for x
    x = 1,128,967.39/919.41
  6. Step 6: Final answer
    x = 1,227.93

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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.