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Finding the Fourth Proportional to 885.99, 1,330.20 and 611.40

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Solution

The fourth proportional to 885.99, 1,330.20 and 611.40 is: 917.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.99 : 1,330.20 = 611.40 : x
  2. Step 2: Convert to fraction form
    885.99/1,330.20 = 611.40/x
  3. Step 3: Cross multiply
    885.99x = 1,330.20 × 611.40
  4. Step 4: Simplify right side
    885.99x = 813,284.28
  5. Step 5: Solve for x
    x = 813,284.28/885.99
  6. Step 6: Final answer
    x = 917.94

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.